Expand description
Representation of quantites, i.e. of unit valued scalars and arrays.
As opposed to other implementations, this crate does not attempt to achieve compile time checks on units. It is written with flexibility in mind and is able to represent arbitrarily complex units. Additional to simple scalar quantities, it also provides utilities for vector valued quantities, based on the ndarray crate, where all entries share the same unit.
For details on the available methods, see the documentation of the Quantity struct and for a list of all units and constants available check out the si module.
§Examples
Calculate pressure of an ideal gas.
let temperature = 25.0 * CELSIUS;
let volume = 1.5 * METER.powi(3);
let moles = 75.0 * MOL;
let pressure = moles * RGAS * temperature / volume;
println!("{:.5}", pressure); // 123.94785 kPaCalculate the gravitational pull of the moon on the earth.
let mass_earth = 5.9724e24 * KILOGRAM;
let mass_moon = 7.346e22 * KILOGRAM;
let distance = 383.398 * KILO * METER;
let force = G * mass_earth * mass_moon / distance.powi(2);
println!("{:.5e}", force); // 1.99208e26 NCalculate the pressure distribution in the atmosphere using the barometric formula.
let z = SIArray1::linspace(1.0 * METER, 70.0 * KILO * METER, 10)?;
let g = 9.81 * METER / SECOND.powi(2);
let m = 28.949 * GRAM / MOL;
let t = 10.0 * CELSIUS;
let p0 = BAR;
let pressure = p0 * (-&z * m * g).to_reduced(RGAS * t)?.mapv(f64::exp);
for i in 0..10 {
println!("z = {:8.5} p = {:9.5}", z.get(i), pressure.get(i));
}
// z = 1.00000 m p = 99.98794 kPa
// z = 7.77867 km p = 39.12796 kPa
// z = 15.55633 km p = 15.31182 kPa
// z = 23.33400 km p = 5.99192 kPa
// z = 31.11167 km p = 2.34480 kPa
// z = 38.88933 km p = 917.58301 Pa
// z = 46.66700 km p = 359.07479 Pa
// z = 54.44467 km p = 140.51557 Pa
// z = 62.22233 km p = 54.98750 Pa
// z = 70.00000 km p = 21.51808 PaModules§
- Implementation of SI units.
Structs§
- Representation of a value with a corresponding unit.
Enums§
- Error type used to indicate unit conversion failures.
Traits§
- A generalized unit.