feat(si): add specific power quantity

src/si/mod.rs

@@ -128,6 +128,7 @@ system! {
         solid_angle::SolidAngle,
         specific_area::SpecificArea,
         specific_heat_capacity::SpecificHeatCapacity,
+        specific_power::SpecificPower,
         specific_volume::SpecificVolume,
         surface_electric_current_density::SurfaceElectricCurrentDensity,
         temperature_coefficient::TemperatureCoefficient,

src/si/specific_power.rs

@@ -0,0 +1,112 @@
+//! Specific Power (base unit watt per kilogram or m² · s⁻³).
+
+quantity! {
+    /// Specific Power (base unit watt per kilogram or m² · s⁻³).
+    quantity: SpecificPower; "specific power";
+    /// Dimension of specific power, L²T⁻³ (base unit watt per kilogram or m² · s⁻³).
+    dimension: ISQ<
+        P2,     // length
+        Z0,     // mass
+        N3,     // time
+        Z0,     // electric current
+        Z0,     // thermodynamic temperature
+        Z0,     // amount of substance
+        Z0>;    // luminous intensity
+    units {
+        @yottawatt_per_kilogram: prefix!(yotta); "YW/kg", "yottawatt per kilogram", "yottawatts per kilogram";
+        @zettawatt_per_kilogram: prefix!(zetta); "ZW/kg", "zettawatt per kilogram", "zettawatts per kilogram";
+        @exawatt_per_kilogram: prefix!(exa); "EW/kg", "exawatt per kilogram", "exawatts per kilogram";
+        @petawatt_per_kilogram: prefix!(peta); "PW/kg", "petawatt per kilogram", "petawatts per kilogram";
+        @terawatt_per_kilogram: prefix!(tera); "TW/kg", "terawatt per kilogram", "terawatts per kilogram";
+        @gigawatt_per_kilogram: prefix!(giga); "GW/kg", "gigawatt per kilogram", "gigawatts per kilogram";
+        @megawatt_per_kilogram: prefix!(mega); "MW/kg", "megawatt per kilogram", "megawatts per kilogram";
+        @kilowatt_per_kilogram: prefix!(kilo); "kW/kg", "kilowatt per kilogram", "kilowatts per kilogram";
+        @hectowatt_per_kilogram: prefix!(hecto); "hW/kg", "hectowatt per kilogram", "hectowatts per kilogram";
+        @decawatt_per_kilogram: prefix!(deca); "daW/kg", "decawatt per kilogram", "decawatts per kilogram";
+        /// Derived unit of specific power.
+        @watt_per_kilogram: prefix!(none); "W/kg", "watt per kilogram", "watts per kilogram";
+        @deciwatt_per_kilogram: prefix!(deci); "dW/kg", "deciwatt per kilogram", "deciwatts per kilogram";
+        @centiwatt_per_kilogram: prefix!(centi); "cW/kg", "centiwatt per kilogram", "centiwatts per kilogram";
+        @milliwatt_per_kilogram: prefix!(milli); "mW/kg", "milliwatt per kilogram", "milliwatts per kilogram";
+        @microwatt_per_kilogram: prefix!(micro); "µW/kg", "microwatt per kilogram", "microwatts per kilogram";
+        @nanowatt_per_kilogram: prefix!(nano); "nW/kg", "nanowatt per kilogram", "nanowatts per kilogram";
+        @picowatt_per_kilogram: prefix!(pico); "pW/kg", "picowatt per kilogram", "picowatts per kilogram";
+        @femtowatt_per_kilogram: prefix!(femto); "fW/kg", "femtowatt per kilogram", "femtowatts per kilogram";
+        @attowatt_per_kilogram: prefix!(atto); "aW/kg", "attowatt per kilogram", "attowatts per kilogram";
+        @zeptowatt_per_kilogram: prefix!(zepto); "zW/kg", "zeptowatt per kilogram", "zeptowatts per kilogram";
+        @yoctowatt_per_kilogram: prefix!(yocto); "yW/kg", "yoctowatt per kilogram", "yoctowatts per kilogram";
+
+        // Less commonly used, but more accurate (reduced) derived unit of specific power.
+        @square_meter_per_cubic_second: 1.0_E0; "m² · s⁻³", "square meter per cubic second", "square meters per cubic second";
+
+        @erg_per_second_per_kilogram: 1.0_E-7; "(erg/s)/kg", "erg per second per kilogram", "ergs per second per kilogram";
+        @foot_pound_per_hour_per_pound: 3.766_161_111_111_111_E-4 * (1.0 / 4.535_920_700E-1); "(ft · lbf/h)/lb", "foot pound-force per hour per pound",
+            "foot pounds-force per hour per pound";
+        @foot_pound_per_minute_per_pound: 2.259_696_666_666_666_6_E-2 * (1.0 / 4.535_920_700E-1); "(ft · lbf/min)/lb",
+            "foot pound-force per minute per pound", "foot pounds-force per minute per pound";
+        @foot_pound_per_second_per_pound: 1.355_818 * (1.0 / 4.535_920_700E-1); "(ft · lbf/s)/lb", "foot pound-force per second per pound",
+            "foot pounds-force per second per pound";
+        @horsepower_per_pound: 7.456_999_E2 * (1.0 / 4.535_920_700E-1); "hp/lb", "horsepower per pound", "horsepower per pound";
+        @horsepower_boiler_per_pound: 9.809_50_E3 * (1.0 / 4.535_920_700E-1); "(hp (S))/lb", "horsepower (boiler) per pound",
+            "horsepower (boiler) per pound";
+        @horsepower_electric_per_pound: 7.46_E2 * (1.0 / 4.535_920_700E-1); "(hp (E))/lb", "horsepower (electric) per pound",
+            "horsepower (electric) per pound";
+        @horsepower_metric_per_pound: 7.354_988_E2 * (1.0 / 4.535_920_700E-1); "(hp (M))/lb", "metric horsepower per pound", "metric horsepower per pound";
+        @horsepower_imperial_per_pound: 7.457_0_E2 * (1.0 / 4.535_920_700E-1); "(hp (I))/lb", "horsepower (Imperial) per pound",
+            "horsepower (Imperial) per pound";
+        @hydraulic_horsepower_per_pound: 7.460_43_E2 * (1.0 / 4.535_920_700E-1); "(hp (hydraulic))/lb", "hydraulic horsepower per pound",
+            "hydraulic horsepower per pound";
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    storage_types! {
+        use crate::num::One;
+        use crate::si::mass as m;
+        use crate::si::power as p;
+        use crate::si::quantities::*;
+        use crate::si::specific_power as sp;
+        use crate::tests::Test;
+
+        #[test]
+        fn check_dimension() {
+            let _: SpecificPower<V> =  Power::new::<p::watt>(V::one())
+                / Mass::new::<m::kilogram>(V::one());
+        }
+
+        #[test]
+        fn check_units() {
+            test::<p::zettawatt, m::kilogram, sp::zettawatt_per_kilogram>();
+            test::<p::exawatt, m::kilogram, sp::exawatt_per_kilogram>();
+            test::<p::petawatt, m::kilogram, sp::petawatt_per_kilogram>();
+            test::<p::terawatt, m::kilogram, sp::terawatt_per_kilogram>();
+            test::<p::gigawatt, m::kilogram, sp::gigawatt_per_kilogram>();
+            test::<p::megawatt, m::kilogram, sp::megawatt_per_kilogram>();
+            test::<p::kilowatt, m::kilogram, sp::kilowatt_per_kilogram>();
+            test::<p::watt, m::kilogram, sp::watt_per_kilogram>();
+            test::<p::centiwatt, m::kilogram, sp::centiwatt_per_kilogram>();
+            test::<p::milliwatt, m::kilogram, sp::milliwatt_per_kilogram>();
+            test::<p::microwatt, m::kilogram, sp::microwatt_per_kilogram>();
+            test::<p::nanowatt, m::kilogram, sp::nanowatt_per_kilogram>();
+            test::<p::picowatt, m::kilogram, sp::picowatt_per_kilogram>();
+            test::<p::femtowatt, m::kilogram, sp::femtowatt_per_kilogram>();
+            test::<p::attowatt, m::kilogram, sp::attowatt_per_kilogram>();
+            test::<p::zeptowatt, m::kilogram, sp::zeptowatt_per_kilogram>();
+            test::<p::yoctowatt, m::kilogram, sp::yoctowatt_per_kilogram>();
+
+            test::<p::watt, m::kilogram, sp::square_meter_per_cubic_second>();
+
+            fn test<P: p::Conversion<V>, M: m::Conversion<V>, SP: sp::Conversion<V>>() {
+                Test::assert_approx_eq(&SpecificPower::new::<SP>(V::one()),
+                    &(Power::new::<P>(V::one()) / Mass::new::<M>(V::one())));
+            }
+        }
+
+        #[test]
+        fn check_unit_conversion() {
+            Test::assert_approx_eq(&SpecificPower::new::<sp::kilowatt_per_kilogram>(3.5).get::<sp::watt_per_kilogram>(), &3500.0);
+            Test::assert_approx_eq(&SpecificPower::new::<sp::watt_per_kilogram>(3.5).get::<sp::horsepower_per_pound>(), &0.0021289693682404946);
+        }
+    }
+}