1 files changed, 107 insertions, 0 deletions
diff --git a/src/unit_of_measurement.rs b/src/unit_of_measurement.rs
new file mode 100644
index 0000000..03bb68c
--- /dev/null
+++ b/src/unit_of_measurement.rs
@@ -0,0 +1,107 @@
+use std::time::Duration;
+
+pub struct MassFlowRate {
+    pub mass: Mass,
+    pub duration: Duration,
+}
+impl MassFlowRate {
+    pub fn as_kilograms_per_minute(&self) -> f64 {
+        self.mass.as_kilograms() / (self.duration.as_secs() as f64 / 60.)
+    }
+
+    pub fn as_pounds_per_minute(&self) -> f64 {
+        self.mass.as_pounds() / (self.duration.as_secs() as f64 / 60.)
+    }
+}
+
+pub struct VolumetricFlowRate {
+    pub volume: Volume,
+    pub duration: Duration,
+}
+impl VolumetricFlowRate {
+    pub fn as_cubic_metres_per_second(&self) -> f64 {
+        self.volume.as_cubic_metres() / self.duration.as_secs() as f64
+    }
+
+    pub fn as_cubic_feet_per_minute(&self) -> f64 {
+        self.volume.as_cubic_feet() / (self.duration.as_secs() as f64 / 60.)
+    }
+}
+
+#[derive(Default)]
+pub struct Mass(f64); // Base unit is grams
+impl Mass {
+    /* constructors */
+    pub fn from_grams(grams: f64) -> Mass {
+        Mass(grams)
+    }
+
+    pub fn from_kilograms(kilos: f64) -> Mass {
+        Mass(kilos / 1000.)
+    }
+
+    pub fn from_moles(moles: f64, molar_mass: f64) -> Mass {
+        let kilos = moles * molar_mass;
+        Mass::from_kilograms(kilos)
+    }
+
+    /* metric */
+    pub fn as_grams(&self) -> f64 {
+        self.0
+    }
+
+    pub fn as_kilograms(&self) -> f64 {
+        self.0 / 1000.
+    }
+
+    /* imperial */
+    pub fn as_pounds(&self) -> f64 {
+        self.0 * 0.002204623
+    }
+}
+
+pub struct Pressure(f64); // Base unit is pascals
+impl Pressure {
+    pub fn from_pascals(pascals: f64) -> Self {
+        Self(pascals)
+    }
+
+    pub fn as_pascals(&self) -> f64 {
+        self.0
+    }
+}
+
+#[derive(Default)]
+pub struct Temperature(f64); // Base unit is kelvin
+impl Temperature {
+    pub fn from_kelvin(kelvin: f64) -> Temperature {
+        Temperature(kelvin)
+    }
+
+    pub fn as_kelvin(&self) -> f64 {
+        self.0
+    }
+}
+
+pub struct Volume(f64); // Base unit is cubic metres
+impl Volume {
+    pub fn from_cubic_metres(cubic_metres: f64) -> Volume {
+        Volume(cubic_metres)
+    }
+
+    pub fn from_cubic_centimetres(cubic_centimetres: f64) -> Volume {
+        Volume(cubic_centimetres / 1_000_000.)
+    }
+
+    pub fn as_cubic_metres(&self) -> f64 {
+        self.0
+    }
+
+    pub fn as_cubic_centimetres(&self) -> f64 {
+        self.0 * 1_000_000.
+    }
+
+    pub fn as_cubic_feet(&self) -> f64 {
+        self.0 * 35.3147
+    }
+}