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add mmHg in pressure units #62

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Oct 18, 2025
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add mmHg in pressure units #62

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33 changes: 27 additions & 6 deletions src/pressure.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,8 @@ pub const PASCAL_PSI_FACTOR: f64 = 6894.76;
pub const PASCAL_TORR_FACTOR: f64 = PASCAL_ATMOSPHERE_FACTOR / 760.0;
/// Number of Pascals in a millitorr
pub const PASCAL_MILLITORR_FACTOR: f64 = PASCAL_TORR_FACTOR / 1000.0;
/// Number of Pascals in mmHg
pub const PASCAL_MMHG_FACTOR: f64 = 133.322387415;

/// The `Pressure` struct can be used to deal with pressures in a common way.
/// Common metric and imperial units are supported.
Expand Down Expand Up @@ -73,17 +75,21 @@ impl Pressure {
Self::from_pascals(atmospheres * PASCAL_ATMOSPHERE_FACTOR)
}

/// Create new Pressure from floating point value in Torr (also often referred to as mmHg)
/// Create new Pressure from floating point value in Torr
pub fn from_torrs(torrs: f64) -> Pressure {
Self::from_pascals(torrs * PASCAL_TORR_FACTOR)
}

/// Create new Pressure from floating point value in millitorr (mTorr, also often referred to
/// as microns for µmHg)
/// Create new Pressure from floating point value in millitorr (mTorr)
pub fn from_millitorrs(millitorrs: f64) -> Pressure {
Self::from_pascals(millitorrs * PASCAL_MILLITORR_FACTOR)
}

/// Create new Pressure from floating point value in millimeter of mercury (mmHg)
pub fn from_millimeter_mercury(mmhg: f64) -> Pressure {
Self::from_pascals(mmhg * PASCAL_MMHG_FACTOR)
}

/// Convert this Pressure into a floating point value in Pascals
pub fn as_pascals(&self) -> f64 {
self.pascals
Expand Down Expand Up @@ -119,16 +125,20 @@ impl Pressure {
self.pascals / PASCAL_ATMOSPHERE_FACTOR
}

/// Convert this Pressure into a floating point value in Torr (also often referred to as mmHg)
/// Convert this Pressure into a floating point value in Torr
pub fn as_torrs(&self) -> f64 {
self.pascals / PASCAL_TORR_FACTOR
}

/// Convert this Pressure into a floating point value in millitorr (mTorr, also often referred
/// to as microns for µmHg)
/// Convert this Pressure into a floating point value in millitorr (mTorr)
pub fn as_millitorrs(&self) -> f64 {
self.pascals / PASCAL_MILLITORR_FACTOR
}

/// Convert this Pressure into a floating point value in millimeter of mercury (mmHg)
pub fn as_millimeter_mercury(&self) -> f64 {
self.pascals / PASCAL_MMHG_FACTOR
}
}

impl Measurement for Pressure {
Expand Down Expand Up @@ -249,6 +259,17 @@ mod test {
assert_almost_eq(o, 13.33224);
}

#[test]
fn mmhg() {
let t = Pressure::from_pascals(100.0);
let o = t.as_millimeter_mercury();
assert_almost_eq(o, 0.7500615758);

let t = Pressure::from_millimeter_mercury(100.0);
let o = t.as_pascals();
assert_almost_eq(o, 13332.2387415);
}

// Traits
#[test]
fn add() {
Expand Down