diff --git a/CHANGELOG.md b/CHANGELOG.md
index e6319f8..454e2e8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+## [5.18.0](https://github.com/shivam091/unit_measurements/compare/v5.17.0...v5.18.0) - 2023-12-16
+
+### What's new
+
+- Added unit group for `mass flow rate` units.
+- Added unit group for `volumetric flow rate` units.
+
+----------
+
 ## [5.17.0](https://github.com/shivam091/unit_measurements/compare/v5.16.0...v5.17.0) - 2023-12-15
 
 ### What's new
diff --git a/lib/unit_measurements/unit_groups/all.rb b/lib/unit_measurements/unit_groups/all.rb
index c315610..ba85399 100644
--- a/lib/unit_measurements/unit_groups/all.rb
+++ b/lib/unit_measurements/unit_groups/all.rb
@@ -47,6 +47,8 @@
 require_relative "radiation_absorbed_dose"
 require_relative "radiation_equivalent_dose"
 require_relative "information_entropy"
+require_relative "mass_flow_rate"
+require_relative "volumetric_flow_rate"
 
 require_relative "sound_level"
 require_relative "plane_angle"
diff --git a/lib/unit_measurements/unit_groups/mass_flow_rate.rb b/lib/unit_measurements/unit_groups/mass_flow_rate.rb
new file mode 100644
index 0000000..95f50e9
--- /dev/null
+++ b/lib/unit_measurements/unit_groups/mass_flow_rate.rb
@@ -0,0 +1,49 @@
+# -*- encoding: utf-8 -*-
+# -*- frozen_string_literal: true -*-
+# -*- warn_indent: true -*-
+
+UnitMeasurements::MassFlowRate = UnitMeasurements.build do
+  primitive "kg/s"
+
+  system :metric do
+    unit "kg/s", aliases: ["kilogramme per second", "kilogrammes per second", "kilogram per second", "kilograms per second"]
+    unit "kg/min", value: "1/60 kg/s", aliases: ["kilogramme per minute", "kilogrammes per minute", "kilogram per minute", "kilograms per minute"]
+    unit "kg/h", value: "1/60 kg/min", aliases: ["kilogramme per hour", "kilogrammes per hour", "kilogram per hour", "kilograms per hour"]
+
+    unit "g/s", value: "1/1000 kg/s", aliases: ["gramme per second", "grammes per second", "gram per second", "grams per second"]
+    unit "g/min", value: "1/60 g/s", aliases: ["gramme per minute", "grammes per minute", "gram per minute", "grams per minute"]
+    unit "g/h", value: "1/60 g/min", aliases: ["gramme per hour", "grammes per hour", "gram per hour", "grams per hour"]
+
+    unit "t/s", value: "1000 kg/s", aliases: ["tonne per second", "tonnes per second", "metric tonne per second", "metric tonnes per second"]
+    unit "t/min", value: "1/60 t/s", aliases: ["tonne per minute", "tonnes per minute", "metric tonne per minute", "metric tonnes per minute"]
+    unit "t/h", value: "1/60 t/min", aliases: ["tonne per hour", "tonnes per hour", "metric tonne per hour", "metric tonnes per hour"]
+  end
+
+  system :us_customary do
+    unit "lb/s", value: "0.45359237 kg/s", aliases: ["pound per second", "pounds per second"]
+    unit "lb/min", value: "1/60 lb/s", aliases: ["pound per minute", "pounds per minute"]
+    unit "lb/h", value: "1/60 lb/min", aliases: ["pound per hour", "pounds per hour"]
+
+    unit "tn/s", value: "2000 lb/s", aliases: ["ton per second", "tons per second", "short ton per second", "short tons per second"]
+    unit "tn/min", value: "1/60 tn/s", aliases: ["ton per minute", "tons per minute", "short ton per minute", "short tons per minute"]
+    unit "tn/h", value: "1/60 tn/min", aliases: ["ton per hour", "tons per hour", "short ton per hour", "short tons per hour"]
+
+    unit "slug/s", value: "14.5939 kg/s", aliases: ["slug per second", "slugs per second"]
+    unit "slug/min", value: "1/60 slug/s", aliases: ["slug per minute", "slugs per minute"]
+    unit "slug/h", value: "1/60 slug/min", aliases: ["slug per hour", "slugs per hour"]
+  end
+
+  system :imperial do
+    unit "oz/s", value: "1/16 lb/s", aliases: ["ounce per second", "ounces per second"]
+    unit "oz/min", value: "1/60 oz/s", aliases: ["ounce per minute", "ounces per minute"]
+    unit "oz/h", value: "1/60 oz/min", aliases: ["ounce per hour", "ounces per hour"]
+
+    unit "gr/s", value: "1/7000 lb/s", aliases: ["grain per second", "grains per second"]
+    unit "gr/min", value: "1/60 gr/s", aliases: ["grain per minute", "grains per minute"]
+    unit "gr/h", value: "1/60 gr/min", aliases: ["grain per hour", "grains per hour"]
+
+    unit "LT/s", value: "2240 lb/s", aliases: ["long ton per second", "long tons per second"]
+    unit "LT/min", value: "1/60 LT/s", aliases: ["long ton per minute", "long tons per minute"]
+    unit "LT/h", value: "1/60 LT/min", aliases: ["long ton per hour", "long tons per hour"]
+  end
+end
diff --git a/lib/unit_measurements/unit_groups/volumetric_flow_rate.rb b/lib/unit_measurements/unit_groups/volumetric_flow_rate.rb
new file mode 100644
index 0000000..b98c748
--- /dev/null
+++ b/lib/unit_measurements/unit_groups/volumetric_flow_rate.rb
@@ -0,0 +1,35 @@
+# -*- encoding: utf-8 -*-
+# -*- frozen_string_literal: true -*-
+# -*- warn_indent: true -*-
+
+UnitMeasurements::VolumetricFlowRate = UnitMeasurements.build do
+  primitive "m³/s"
+
+  system :metric do
+    unit "m³/s", aliases: ["m^3/s", "cubic metre per second", "cubic metres per second", "cubic meter per second", "cubic meters per second"]
+    unit "m³/min", value: "1/60 m³/s", aliases: ["m^3/min", "cubic metre per minute", "cubic metres per minute", "cubic meter per minute", "cubic meters per minute"]
+    unit "m³/h", value: "1/60 m³/min", aliases: ["m^3/h", "cubic metre per hour", "cubic metres per hour", "cubic meter per hour", "cubic meters per hour"]
+
+    unit "l/s", value: "1/1000 m³/s", aliases: ["L/s", "litre per second", "litres per second", "liter per second", "liters per second"]
+    unit "l/min", value: "1/60 l/s", aliases: ["L/min", "litre per minute", "litres per minute", "liter per minute", "liters per minute"]
+    unit "l/h", value: "1/60 l/min", aliases: ["L/h", "litre per hour", "litres per hour", "liter per hour", "liters per hour"]
+  end
+
+  system :imperial do
+    unit "ft³/s", value: "0.028316846592 m³/s", aliases: ["ft^3/s", "cubic foot per second", "cubic feet per second"]
+    unit "ft³/min", value: "1/60 ft³/s", aliases: ["ft^3/min", "cubic foot per minute", "cubic feet per minute"]
+    unit "ft³/h", value: "1/60 ft³/min", aliases: ["ft^3/h", "cubic foot per hour", "cubic feet per hour"]
+
+    unit "in³/s", value: "1.6387064e-5 m³/s", aliases: ["in^3/s", "cubic inch per second", "cubic inches per second"]
+    unit "in³/min", value: "1/60 in³/s", aliases: ["in^3/min", "cubic inch per minute", "cubic inches per minute"]
+    unit "in³/h", value: "1/60 in³/min", aliases: ["in^3/h", "cubic inch per hour", "cubic inches per hour"]
+
+    unit "yd³/s", value: "0.764554857984 m³/s", aliases: ["yd^3/s", "cubic yard per second", "cubic yards per second"]
+    unit "yd³/min", value: "1/60 yd³/s", aliases: ["yd^3/min", "cubic yard per minute", "cubic yards per minute"]
+    unit "yd³/h", value: "1/60 yd³/min", aliases: ["yd^3/h", "cubic yard per hour", "cubic yards per hour"]
+
+    unit "gal/s", value: "0.00454609 m³/s", aliases: ["gallon per second", "gallons per second"]
+    unit "gal/min", value: "1/60 gal/s", aliases: ["gallon per minute", "gallons per minute"]
+    unit "gal/h", value: "1/60 gal/min", aliases: ["gallon per hour", "gallons per hour"]
+  end
+end
diff --git a/spec/unit_measurements/comparison_spec.rb b/spec/unit_measurements/comparison_spec.rb
index 03545ef..b762a8c 100644
--- a/spec/unit_measurements/comparison_spec.rb
+++ b/spec/unit_measurements/comparison_spec.rb
@@ -51,11 +51,5 @@
         expect(length1.between?(length2, length3)).to be_falsy
       end
     end
-
-    describe "#between?" do
-      it "returns true" do
-        expect(length1.between?(length2, length3)).to be_falsy
-      end
-    end
   end
 end
diff --git a/spec/unit_measurements/unit_groups/mass_flow_rate_spec.rb b/spec/unit_measurements/unit_groups/mass_flow_rate_spec.rb
new file mode 100644
index 0000000..2802c26
--- /dev/null
+++ b/spec/unit_measurements/unit_groups/mass_flow_rate_spec.rb
@@ -0,0 +1,115 @@
+# -*- encoding: utf-8 -*-
+# -*- frozen_string_literal: true -*-
+# -*- warn_indent: true -*-
+
+# spec/unit_measurements/unit_groups/mass_flow_rate_spec.rb
+
+RSpec.describe UnitMeasurements::MassFlowRate do
+  describe "kg/s" do
+    subject { described_class.new(5, "kg/s") }
+
+    it "converts to kg/min" do
+      expect(subject.convert_to("kg/min").quantity).to eq(300)
+    end
+
+    it "converts to kg/h" do
+      expect(subject.convert_to("kg/h").quantity).to eq(18000)
+    end
+
+    it "converts to g/s" do
+      expect(subject.convert_to("g/s").quantity).to eq(5000)
+    end
+
+    it "converts to g/min" do
+      expect(subject.convert_to("g/min").quantity).to eq(300000)
+    end
+
+    it "converts to g/h" do
+      expect(subject.convert_to("g/h").quantity).to eq(18000000)
+    end
+
+    it "converts to t/s" do
+      expect(subject.convert_to("t/s").quantity).to eq(0.005)
+    end
+
+    it "converts to t/min" do
+      expect(subject.convert_to("t/min").quantity).to eq(0.3)
+    end
+
+    it "converts to t/h" do
+      expect(subject.convert_to("t/h").quantity).to eq(18)
+    end
+
+    it "converts to lb/s" do
+      expect(subject.convert_to("lb/s").quantity).to eq(11.0231131092439)
+    end
+
+    it "converts to lb/min" do
+      expect(subject.convert_to("lb/min").quantity).to eq(661.386786554633)
+    end
+
+    it "converts to lb/h" do
+      expect(subject.convert_to("lb/h").quantity).to eq(39683.207193278)
+    end
+
+    it "converts to tn/s" do
+      expect(subject.convert_to("tn/s").quantity).to eq(0.00551155655462194)
+    end
+
+    it "converts to tn/min" do
+      expect(subject.convert_to("tn/min").quantity).to eq(0.330693393277316)
+    end
+
+    it "converts to tn/h" do
+      expect(subject.convert_to("tn/h").quantity).to eq(19.841603596639)
+    end
+
+    it "converts to slug/s" do
+      expect(subject.convert_to("slug/s").quantity).to eq(0.342608898238305)
+    end
+
+    it "converts to slug/min" do
+      expect(subject.convert_to("slug/min").quantity).to eq(20.5565338942983)
+    end
+
+    it "converts to slug/h" do
+      expect(subject.convert_to("slug/h").quantity).to eq(1233.3920336579)
+    end
+
+    it "converts to oz/s" do
+      expect(subject.convert_to("oz/s").quantity).to eq(176.369809747902)
+    end
+
+    it "converts to oz/min" do
+      expect(subject.convert_to("oz/min").quantity).to eq(10582.1885848741)
+    end
+
+    it "converts to oz/h" do
+      expect(subject.convert_to("oz/h").quantity).to eq(634931.315092447)
+    end
+
+    it "converts to gr/s" do
+      expect(subject.convert_to("gr/s").quantity).to eq(77161.7917647071)
+    end
+
+    it "converts to gr/min" do
+      expect(subject.convert_to("gr/min").quantity).to eq(4.62970750588243e+6)
+    end
+
+    it "converts to gr/h" do
+      expect(subject.convert_to("gr/h").quantity).to eq(2.77782450352946e+8)
+    end
+
+    it "converts to LT/s" do
+      expect(subject.convert_to("LT/s").quantity).to eq(0.0049210326380553)
+    end
+
+    it "converts to LT/min" do
+      expect(subject.convert_to("LT/min").quantity).to eq(0.295261958283318)
+    end
+
+    it "converts to LT/h" do
+      expect(subject.convert_to("LT/h").quantity).to eq(17.7157174969991)
+    end
+  end
+end
diff --git a/spec/unit_measurements/unit_groups/volumetric_flow_rate_spec.rb b/spec/unit_measurements/unit_groups/volumetric_flow_rate_spec.rb
new file mode 100644
index 0000000..28b6839
--- /dev/null
+++ b/spec/unit_measurements/unit_groups/volumetric_flow_rate_spec.rb
@@ -0,0 +1,79 @@
+# -*- encoding: utf-8 -*-
+# -*- frozen_string_literal: true -*-
+# -*- warn_indent: true -*-
+
+# spec/unit_measurements/unit_groups/volumetric_flow_rate_spec.rb
+
+RSpec.describe UnitMeasurements::VolumetricFlowRate do
+  describe "m³/s" do
+    subject { described_class.new(5, "m³/s") }
+
+    it "converts to m³/min" do
+      expect(subject.convert_to("m³/min").quantity).to eq(300)
+    end
+
+    it "converts to m³/h" do
+      expect(subject.convert_to("m³/h").quantity).to eq(18000)
+    end
+
+    it "converts to l/s" do
+      expect(subject.convert_to("l/s").quantity).to eq(5000)
+    end
+
+    it "converts to l/min" do
+      expect(subject.convert_to("l/min").quantity).to eq(3e+5)
+    end
+
+    it "converts to l/h" do
+      expect(subject.convert_to("l/h").quantity).to eq(1.8e+7)
+    end
+
+    it "converts to ft³/s" do
+      expect(subject.convert_to("ft³/s").quantity).to eq(176.573333607443)
+    end
+
+    it "converts to ft³/min" do
+      expect(subject.convert_to("ft³/min").quantity).to eq(10594.4000164466)
+    end
+
+    it "converts to ft³/h" do
+      expect(subject.convert_to("ft³/h").quantity).to eq(635664.000986795)
+    end
+
+    it "converts to in³/s" do
+      expect(subject.convert_to("in³/s").quantity).to eq(305118.720473661)
+    end
+
+    it "converts to in³/min" do
+      expect(subject.convert_to("in³/min").quantity).to eq(1.83071232284197e+7)
+    end
+
+    it "converts to in³/h" do
+      expect(subject.convert_to("in³/h").quantity).to eq(1.09842739370518e+9)
+    end
+
+    it "converts to yd³/s" do
+      expect(subject.convert_to("yd³/s").quantity).to eq(6.53975309657196)
+    end
+
+    it "converts to yd³/min" do
+      expect(subject.convert_to("yd³/min").quantity).to eq(392.385185794318)
+    end
+
+    it "converts to yd³/h" do
+      expect(subject.convert_to("yd³/h").quantity).to eq(23543.1111476591)
+    end
+
+    it "converts to gal/s" do
+      expect(subject.convert_to("gal/s").quantity).to eq(1099.84624149544)
+    end
+
+    it "converts to gal/min" do
+      expect(subject.convert_to("gal/min").quantity).to eq(65990.7744897263)
+    end
+
+    it "converts to gal/h" do
+      expect(subject.convert_to("gal/h").quantity).to eq(3.95944646938358e+6)
+    end
+  end
+end
diff --git a/units.md b/units.md
index c487b35..fe2720b 100644
--- a/units.md
+++ b/units.md
@@ -244,19 +244,66 @@ These units are defined in `UnitMeasurements::Density`.
 | 13 | slug/in³ | slug/in^3, slug per cubic inch, slugs per cubic inch |
 | 14 | ρₚ | planck density, quantum density |
 
-## 11. Quantity
-
-These units are defined in `UnitMeasurements::Quantity`.
-
-| # | Name | Aliases |
-|:--|:--|:--|
-| 1 | pc | pcs, piece, pieces |
-| 2 | pr | pair, pairs |
-| 3 | gr | gross, grosses |
-| 4 | dz | doz, dozen, dozens |
-| 5 | gg | great gross, great grosses, grand gross, grand grosses, dozen gross, dozen grosses |
-
-## 12. Sound level
+## 11. Mass flow rate, mass flow, mass flux, or mass current
+
+These units are defined in `UnitMeasurements::MassFlowRate`.
+
+| # | Name | Aliases |
+|:--|:--|:--|
+| _1_ | _kg/s_ | _kilogramme per second, kilogrammes per second, kilogram per second, kilograms per second_ |
+| 2 | kg/min | kilogramme per minute, kilogrammes per minute, kilogram per minute, kilograms per minute |
+| 3 | kg/h | kilogramme per hour, kilogrammes per hour, kilogram per hour, kilograms per hour |
+| 4 | g/s | gramme per second, grammes per second, gram per second, grams per second |
+| 5 | g/min | gramme per minute, grammes per minute, gram per minute, grams per minute |
+| 6 | g/h | gramme per hour, grammes per hour, gram per hour, grams per hour |
+| 7 | t/s | tonne per second, tonnes per second, metric tonne per second, metric tonnes per second |
+| 8 | t/min | tonne per minute, tonnes per minute, metric tonne per minute, metric tonnes per minute |
+| 9 | t/h | tonne per hour, tonnes per hour, metric tonne per hour, metric tonnes per hour |
+| 10 | lb/s | pound per second, pounds per second |
+| 11 | lb/min | pound per minute, pounds per minute |
+| 12 | lb/h | pound per hour, pounds per hour |
+| 13 | tn/s | ton per second, tons per second, short ton per second, short tons per second |
+| 14 | tn/min | ton per minute, tons per minute, short ton per minute, short tons per minute |
+| 15 | tn/h | ton per hour, tons per hour, short ton per hour, short tons per hour |
+| 16 | slug/s | slug per second, slugs per second |
+| 17 | slug/min | slug per minute, slugs per minute |
+| 18 | slug/h | slug per hour, slugs per hour |
+| 19 | oz/s | ounce per second, ounces per second |
+| 10 | oz/min | ounce per minute, ounces per minute |
+| 21 | oz/h | ounce per hour, ounces per hour |
+| 22 | gr/s | grain per second, grains per second |
+| 23 | gr/min | grain per minute, grains per minute |
+| 24 | gr/h | grain per hour, grains per hour |
+| 25 | LT/s | long ton per second, long tons per second |
+| 26 | LT/min | long ton per minute, long tons per minute |
+| 27 | LT/h | long ton per hour, long tons per hour |
+
+## 12. Volumetric flow rate, volume flow rate or volume velocity
+
+These units are defined in `UnitMeasurements::VolumetricFlowRate`.
+
+| # | Name | Aliases |
+|:--|:--|:--|
+| _1_ | _m³/s_ | _m^3/s, cubic metre per second, cubic metres per second, cubic meter per second, cubic meters per second_ |
+| 2 | m³/min | m^3/min, cubic metre per minute, cubic metres per minute, cubic meter per minute, cubic meters per minute |
+| 3 | m³/h | m^3/h, cubic metre per hour, cubic metres per hour, cubic meter per hour, cubic meters per hour |
+| 4 | l/s | L/s, litre per second, litres per second, liter per second, liters per second |
+| 5 | l/min | L/min, litre per minute, litres per minute, liter per minute, liters per minute |
+| 6 | l/h | L/h, litre per hour, litres per hour, liter per hour, liters per hour |
+| 7 | ft³/s | ft^3/s, cubic foot per second, cubic feet per second |
+| 8 | ft³/min | ft^3/min, cubic foot per minute, cubic feet per minute |
+| 9 | ft³/h | ft^3/h, cubic foot per hour, cubic feet per hour |
+| 10 | in³/s | in^3/s, cubic inch per second, cubic inches per second |
+| 11 | in³/min | in^3/min, cubic inch per minute, cubic inches per minute |
+| 12 | in³/h | in^3/h, cubic inch per hour, cubic inches per hour |
+| 13 | yd³/s | yd^3/s, cubic yard per second, cubic yards per second |
+| 14 | yd³/min | yd^3/min, cubic yard per minute, cubic yards per minute |
+| 15 | yd³/h | yd^3/h, cubic yard per hour, cubic yards per hour |
+| 16 | gal/s | gallon per second, gallons per second |
+| 17 | gal/min | gallon per minute, gallons per minute |
+| 18 | gal/h | gallon per hour, gallons per hour |
+
+## 13. Sound level
 
 These units are defined in `UnitMeasurements::SoundLevel`.
 
@@ -266,7 +313,7 @@ These units are defined in `UnitMeasurements::SoundLevel`.
 | _2_ | _dB_ | _decibel, decibels_ |
 | 3 | Np | neper, nepers |
 
-## 13. Plane angle
+## 14. Plane angle
 
 These units are defined in `UnitMeasurements::PlaneAngle`.
 
@@ -288,7 +335,7 @@ These units are defined in `UnitMeasurements::PlaneAngle`.
 | 14 | sextant | sextants |
 | 15 | quadrant | quadrants |
 
-## 14. Solid angle or 3D angle
+## 15. Solid angle or 3D angle
 
 These units are defined in `UnitMeasurements::SolidAngle`.
 
@@ -300,7 +347,7 @@ These units are defined in `UnitMeasurements::SolidAngle`.
 | 4 | arcmin² | (′)², sq ′, square arcminute, square arcminutes |
 | 5 | arcsec² | (″)², sq ″, square arcsecond, square arcseconds |
 
-## 15. Force
+## 16. Force
 
 These units are defined in `UnitMeasurements::Force`.
 
@@ -325,7 +372,7 @@ These units are defined in `UnitMeasurements::Force`.
 | 17 | (lb⋅in)/s² | (lb\*in)/s^2, pound inch per second squared |
 | 18 | Fₚ | planck force, quantum force |
 
-## 16. Velocity or speed
+## 17. Velocity or speed
 
 These units are defined in `UnitMeasurements::Velocity`.
 
@@ -346,7 +393,7 @@ These units are defined in `UnitMeasurements::Velocity`.
 | 13 | mi/h | mph, mile per hour, miles per hour |
 | 14 | fur/ftn | furlong per fortnight, furlongs per fortnight |
 
-## 17. Acceleration
+## 18. Acceleration
 
 These units are defined in `UnitMeasurements::Acceleration`.
 
@@ -366,7 +413,7 @@ These units are defined in `UnitMeasurements::Acceleration`.
 | 12 | Kn/s | knot per second, knots per second |
 | 13 | aₚ | planck acceleration, quantum acceleration |
 
-## 18. Angular velocity or rotational speed
+## 19. Angular velocity or rotational speed
 
 These units are defined in `UnitMeasurements::AngularVelocity`.
 
@@ -385,7 +432,7 @@ These units are defined in `UnitMeasurements::AngularVelocity`.
 | 11 | gon/min | ᵍ/min, gradian per minute, gradians per minute |
 | 12 | gon/h | ᵍ/h, gradian per hour, gradians per hour |
 
-## 19. Angular acceleration
+## 20. Angular acceleration
 
 These units are defined in `UnitMeasurements::AngularAcceleration`.
 
@@ -395,7 +442,19 @@ These units are defined in `UnitMeasurements::AngularAcceleration`.
 | 2 | deg/s² | °/s², deg/s^2, degree per second squared, degrees per second squared |
 | 3 | gon/s² | ᵍ/s², gon/s^2, gradian per second squared, gradians per second squared |
 
-## 20. Electric potential or electromotive force
+## 21. Quantity
+
+These units are defined in `UnitMeasurements::Quantity`.
+
+| # | Name | Aliases |
+|:--|:--|:--|
+| 1 | pc | pcs, piece, pieces |
+| 2 | pr | pair, pairs |
+| 3 | gr | gross, grosses |
+| 4 | dz | doz, dozen, dozens |
+| 5 | gg | great gross, great grosses, grand gross, grand grosses, dozen gross, dozen grosses |
+
+## 22. Electric potential or electromotive force
 
 These units are defined in `UnitMeasurements::ElectricPotential`.
 
@@ -407,7 +466,7 @@ These units are defined in `UnitMeasurements::ElectricPotential`.
 | 4 | W/A | watt per ampere, watts per ampere |
 | 5 | J/C | joule per coulomb, joules per coulomb |
 
-## 21. Electric charge
+## 23. Electric charge
 
 These units are defined in `UnitMeasurements::ElectricCharge`.
 
@@ -420,7 +479,7 @@ These units are defined in `UnitMeasurements::ElectricCharge`.
 | 5 | Fd | faraday, faradays |
 | 6 | qₚ | planck charge, quantum charge |
 
-## 22. Electrical capacitance
+## 24. Electrical capacitance
 
 These units are defined in `UnitMeasurements::ElectricalCapacitance`.
 
@@ -431,7 +490,7 @@ These units are defined in `UnitMeasurements::ElectricalCapacitance`.
 | 3 | statF | statfarad, statfarads |
 | 4 | C/V | coulomb/volt, coulombs/volt, coulomb per volt, coulombs per volt |
 
-## 23. Electrical elastance
+## 25. Electrical elastance
 
 These units are defined in `UnitMeasurements::ElectricalElastance`.
 
@@ -440,7 +499,7 @@ These units are defined in `UnitMeasurements::ElectricalElastance`.
 | _1_ | _D*_ | _F⁻¹, daraf, darafs, reciprocal farad, reciprocal farads_ |
 | 2 | V/C | volt/coulomb, volts/coulomb, volt per coulomb, volts per coulomb |
 
-## 24. Electrical resistance or impedance
+## 26. Electrical resistance or impedance
 
 These units are defined in `UnitMeasurements::ElectricalResistance`.
 
@@ -452,7 +511,7 @@ These units are defined in `UnitMeasurements::ElectricalResistance`.
 | 4 | S | siemens, mho, mhos |
 | 5 | V/A | volt/amp, volts/amp, volt/ampere, volts/ampere, volt per ampere, volts per ampere |
 
-## 25. Electric conductance
+## 27. Electric conductance
 
 These units are defined in `UnitMeasurements::ElectricConductance`.
 
@@ -463,7 +522,7 @@ These units are defined in `UnitMeasurements::ElectricConductance`.
 | 3 | statS | stat℧, statsiemens, statmho, statmhos |
 | 3 | A/V | amp/volt, amps/volt, ampere/volt, amperes/volt, ampere per volt, amperes per volt |
 
-## 26. Electrical inductance
+## 28. Electrical inductance
 
 These units are defined in `UnitMeasurements::ElectricalInductance`.
 
@@ -474,7 +533,7 @@ These units are defined in `UnitMeasurements::ElectricalInductance`.
 | 3 | statH | stathenry, stathenries |
 | 4 | Wb/A | weber per ampere, webers per ampere |
 
-## 27. Magnetic flux
+## 29. Magnetic flux
 
 These units are defined in `UnitMeasurements::MagneticFlux`.
 
@@ -485,7 +544,7 @@ These units are defined in `UnitMeasurements::MagneticFlux`.
 | 3 | T·m² | T*m^2, tesla-square meter, tesla-square metre |
 | 4 | G·cm² | G*cm^2, gauss-square centimeter, gauss-square centimetre |
 
-## 28. Magnetic induction
+## 30. Magnetic induction
 
 These units are defined in `UnitMeasurements::MagneticInduction`.
 
@@ -494,7 +553,7 @@ These units are defined in `UnitMeasurements::MagneticInduction`.
 | _1_ | _T*_ | _tesla, teslas_ |
 | 2 | G | Gs, gauss |
 
-## 29. Magnetic field
+## 31. Magnetic field
 
 These units are defined in `UnitMeasurements::MagneticField`.
 
@@ -503,7 +562,7 @@ These units are defined in `UnitMeasurements::MagneticField`.
 | _1_ | _Oe*_ | _oersted, oersteds_ |
 | 2 | A/m | ampere/meter, ampere/metre, amperes/meter, amperes/metre, ampere per meter, ampere per metre, amperes per meter, amperes per metre |
 
-## 30. Catalytic activity
+## 32. Catalytic activity
 
 These units are defined in `UnitMeasurements::CatalyticActivity`.
 
@@ -512,7 +571,7 @@ These units are defined in `UnitMeasurements::CatalyticActivity`.
 | _1_ | _kat*_ | _katal, katals_ |
 | 2 | U | unit, units, enzUnit |
 
-## 31. Electric dipole moment
+## 33. Electric dipole moment
 
 These units are defined in `UnitMeasurements::ElectricDipoleMoment`.
 
@@ -521,7 +580,7 @@ These units are defined in `UnitMeasurements::ElectricDipoleMoment`.
 | _1_ | _C⋅m*_ | _C*m, coulomb-meter, coulomb-metre_ |
 | 2 | D | debye, debyes |
 
-## 32. Electric quadrupole moment
+## 34. Electric quadrupole moment
 
 These units are defined in `UnitMeasurements::ElectricQuadrupoleMoment`.
 
@@ -531,7 +590,7 @@ These units are defined in `UnitMeasurements::ElectricQuadrupoleMoment`.
 | 2 | statC·cm² | statC*m^2, statcoulomb square meter, statcoulomb square metre |
 | 3 | B | buckingham, buckinghams |
 
-## 33. Pressure or mechanical stress
+## 35. Pressure or mechanical stress
 
 These units are defined in `UnitMeasurements::Pressure`.
 
@@ -566,7 +625,7 @@ These units are defined in `UnitMeasurements::Pressure`.
 | 27 | kgf/dm² | kgf/dm^2, kilogram-force per square decimetre, kilogramme-force per square decimetre |
 | 28 | Pₚ | planck pressure, quantum pressure |
 
-## 34. Torque or moment of force
+## 36. Torque or moment of force
 
 These units are defined in `UnitMeasurements::Torque`.
 
@@ -590,7 +649,7 @@ These units are defined in `UnitMeasurements::Torque`.
 | 16 | lbf⋅in | lb⋅in, lbf\*in, lb\*in, pound-force inch, pound-inch |
 | 17 | lbf⋅ft | lb⋅ft, lbf\*ft, lb\*ft, pound-force foot, pound-foot |
 
-## 35. Luminous flux
+## 37. Luminous flux
 
 These units are defined in `UnitMeasurements::LuminousFlux`.
 
@@ -598,7 +657,7 @@ These units are defined in `UnitMeasurements::LuminousFlux`.
 |:--|:--|:--|
 | _1_ | _lm*_ | _lumen, lumens_ |
 
-## 36. Illuminance
+## 38. Illuminance
 
 These units are defined in `UnitMeasurements::Illuminance`.
 
@@ -609,7 +668,7 @@ These units are defined in `UnitMeasurements::Illuminance`.
 | 3 | fc | footcandle, lm/ft², lm/ft^2, lumen per square foot |
 | 4 | nx | nox |
 
-## 37. Luminance
+## 39. Luminance
 
 These units are defined in `UnitMeasurements::Luminance`.
 
@@ -622,7 +681,7 @@ These units are defined in `UnitMeasurements::Luminance`.
 | 5 | L | lambert, lamberts |
 | 6 | sb | stlib |
 
-## 38. Frequency
+## 40. Frequency
 
 These units are defined in `UnitMeasurements::Frequency`.
 
@@ -633,7 +692,7 @@ These units are defined in `UnitMeasurements::Frequency`.
 | 3 | deg/s | °/s, degree per second, degrees per second |
 | 4 | rev/s | rps, revolution per second, revolutions per second |
 
-## 39. Power or heat flow rate
+## 41. Power or heat flow rate
 
 These units are defined in `UnitMeasurements::Power`.
 
@@ -666,7 +725,7 @@ These units are defined in `UnitMeasurements::Power`.
 | 25 | atm⋅ft³/h | atm\*ft^3/h, atmosphere-cubic foot per hour |
 | 26 | Pₚ | planck power, quantum power |
 
-## 40. Energy
+## 42. Energy
 
 These units are defined in `UnitMeasurements::Energy`.
 
@@ -698,7 +757,7 @@ These units are defined in `UnitMeasurements::Energy`.
 | 24 | gal⋅atm | gal*atm, gallon-atmosphere |
 | 25 | Eₚ | planck energy, quantum energy |
 
-## 41. Dynamic viscosity
+## 43. Dynamic viscosity
 
 These units are defined in `UnitMeasurements::DynamicViscosity`.
 
@@ -712,7 +771,7 @@ These units are defined in `UnitMeasurements::DynamicViscosity`.
 | 6 | (lbf⋅s)/in² | (lb⋅s)/in², (lbf\*s)/in^2, (lb\*s)/in^2, pound-force second per square inch |
 | 7 | Pl | poiseuille |
 
-## 42. Kinetic viscosity
+## 44. Kinetic viscosity
 
 These units are defined in `UnitMeasurements::KineticViscosity`.
 
@@ -723,7 +782,7 @@ These units are defined in `UnitMeasurements::KineticViscosity`.
 | 3 | ft²/s | ft^2/s, square foot per second, square feet per second |
 | 4 | in²/s | in^2/s, square inch per second, square inches per second |
 
-## 43. Magnetomotive force
+## 45. Magnetomotive force
 
 These units are defined in `UnitMeasurements::MagnetomotiveForce`.
 
@@ -732,7 +791,7 @@ These units are defined in `UnitMeasurements::MagnetomotiveForce`.
 | _1_ | _A⋅t_ | _A*t, ampere-turn_ |
 | 2 | Gb | Gi, gilbert, gilberts |
 
-## 44. Radioactivity
+## 46. Radioactivity
 
 These units are defined in `UnitMeasurements::Radioactivity`.
 
@@ -742,7 +801,7 @@ These units are defined in `UnitMeasurements::Radioactivity`.
 | 2 | Ci | curie, curies |
 | 3 | Rd | rutherford, rutherfords |
 
-## 45. Radiation exposure
+## 47. Radiation exposure
 
 These units are defined in `UnitMeasurements::RadiationExposure`.
 
@@ -751,7 +810,7 @@ These units are defined in `UnitMeasurements::RadiationExposure`.
 | _1_ | _C/kg*_ | _coulomb per kilogram, coulomb per kilogramme, coulombs per kilogram, coulombs per kilogramme_ |
 | 2 | R | röntgen, roentgen, roentgens |
 
-## 46. Radiation absorbed dose
+## 48. Radiation absorbed dose
 
 These units are defined in `UnitMeasurements::RadiationAbsorbedDose`.
 
@@ -761,7 +820,7 @@ These units are defined in `UnitMeasurements::RadiationAbsorbedDose`.
 | 2 | erg/g | erg per gram, erg per gramme, ergs per gram, ergs per gramme |
 | 3 | rad | radiation absorbed dose |
 
-## 47. Radiation equivalent dose
+## 49. Radiation equivalent dose
 
 These units are defined in `UnitMeasurements::RadiationEquivalentDose`.
 
@@ -770,7 +829,7 @@ These units are defined in `UnitMeasurements::RadiationEquivalentDose`.
 | _1_ | _Sv*_ | _sievert, sieverts_ |
 | 2 | rem | röntgen equivalent man, roentgen equivalent man |
 
-## 48. Information entropy
+## 50. Information entropy
 
 These units are defined in `UnitMeasurements::InformationEntropy`.