Add Electric Field quantity with corresponding units and test.

src/si/electric_field.rs

@@ -0,0 +1,75 @@
+//! Electric Field (base unit volt per meter, m ⋅ kg ⋅ s⁻³ ⋅ A⁻¹).
+
+quantity! {
+    /// Electric Field (base unit volt per meter, m ⋅ kg ⋅ s⁻³ ⋅ A⁻¹).
+    quantity: ElectricField; "electric field";
+    /// Dimension of electric field, LMT⁻³I⁻¹ (base unit volt per meter, m ⋅ kg ⋅ s⁻³ ⋅ A⁻¹).
+    dimension: ISQ<
+        P1,     // length
+        P1,     // mass
+        N3,     // time
+        N1,     // electric current
+        Z0,     // thermodynamic temperature
+        Z0,     // amount of substance
+        Z0>;    // luminous intensity
+    units {
+        @volt_per_meter: prefix!(none); "V/m",
+            "volt per meter", "volts per meter";
+        @volt_per_centimeter: prefix!(none) / prefix!(centi); "V/cm",
+            "volt per centimeter", "volts per centimeter";
+        @volt_per_millimeter: prefix!(none) / prefix!(milli); "V/mm",
+            "volt per millimeter", "volts per millimeter";  
+        @volt_per_micrometer: prefix!(none) / prefix!(micro); "V/μm",
+            "volt per micrometer", "volts per micrometer"; 
+        @kilovolt_per_millimeter: prefix!(kilo) / prefix!(milli); "kV/mm",
+            "kilovolt per millimeter", "kilovolts per millimeter"; 
+        @megavolt_per_meter: prefix!(mega); "MV/m",
+            "megavolt per meter", "megavolts per meter";
+        @megavolt_per_centimeter: prefix!(mega) / prefix!(centi); "MV/cm",
+            "megavolt per centimeter", "megavolts per centimeter";             
+        @volt_per_mil: prefix!(none) / 2.54_E-5; "V/mil",
+            "volt per mil", "volts per mil";            
+
+        // Eₕ / (e ⋅ a₀)     
+        @atomic_unit_of_electric_field: 5.142_206_747_63_E11; "a.u. of electric field",
+            "atomic unit of electric field", "atomic units of electric field";            
+    }
+}
+
+#[cfg(test)]
+mod test {
+    storage_types! {
+        use crate::num::One;
+        use crate::si::electric_field as ef;
+        use crate::si::quantities::*;
+        use crate::si::electric_potential as ep;
+        use crate::si::length as l;
+        use crate::tests::Test;
+
+        #[test]
+        fn check_dimension() {
+            let _: ElectricField<V> = ElectricPotential::new::<ep::volt>(V::one())
+                / Length::new::<l::meter>(V::one());
+        }
+
+        #[test]
+        fn check_units() {
+            test::<ef::volt_per_meter, l::meter, ep::volt>();
+            test::<ef::volt_per_centimeter, l::centimeter, ep::volt>();
+            test::<ef::volt_per_millimeter, l::millimeter, ep::volt>();
+            test::<ef::volt_per_micrometer, l::micrometer, ep::volt>();
+            test::<ef::kilovolt_per_millimeter, l::millimeter, ep::kilovolt>();
+            test::<ef::megavolt_per_centimeter, l::centimeter, ep::megavolt>();
+            test::<ef::megavolt_per_meter, l::meter, ep::megavolt>();
+
+            test::<ef::volt_per_mil, l::mil, ep::volt>();
+
+
+            fn test<EF: ef::Conversion<V>, L: l::Conversion<V>, EP: ep::Conversion<V>>() {
+                Test::assert_approx_eq(&ElectricField::new::<EF>(V::one()),
+                    &(ElectricPotential::new::<EP>(V::one())
+                        / Length::new::<L>(V::one())));
+            }
+        }
+    }
+}

src/si/mod.rs

@@ -60,6 +60,7 @@ system! {
         curvature::Curvature,
         electric_charge::ElectricCharge,
         electric_current::ElectricCurrent,
+        electric_field::ElectricField,
         electric_potential::ElectricPotential,
         electrical_conductance::ElectricalConductance,
         electrical_resistance::ElectricalResistance,