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Use SI constants in CO unit converter (#153187)

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epenet
2025-10-10 14:59:20 +02:00
committed by GitHub
parent e887d5e6ad
commit b25622f40e
3 changed files with 24 additions and 10 deletions
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24
homeassistant/util/unit_conversion.py
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@@ -91,6 +91,17 @@ _GALLON_TO_CUBIC_METER = 231 * pow(_IN_TO_M, 3) # US gallon is 231 cubic inches
_FLUID_OUNCE_TO_CUBIC_METER = _GALLON_TO_CUBIC_METER / 128 # 128 fl. oz. in a US gallon
_CUBIC_FOOT_TO_CUBIC_METER = pow(_FOOT_TO_M, 3)
# Gas concentration conversion constants
_IDEAL_GAS_CONSTANT = 8.31446261815324 # m3⋅Pa⋅K⁻¹⋅mol⁻¹
# Ambient constants based on European Commission recommendations (20 °C and 1013mb)
_AMBIENT_TEMPERATURE = 293.15 # K (20 °C)
_AMBIENT_PRESSURE = 101325 # Pa (1 atm)
_AMBIENT_IDEAL_GAS_MOLAR_VOLUME = ( # m3⋅mol⁻¹
_IDEAL_GAS_CONSTANT * _AMBIENT_TEMPERATURE / _AMBIENT_PRESSURE
)
# Molar masses in g⋅mol⁻¹
_CARBON_MONOXIDE_MOLAR_MASS = 28.01
class BaseUnitConverter:
"""Define the format of a conversion utility."""
@@ -169,14 +180,17 @@ class BaseUnitConverter:
class CarbonMonoxideConcentrationConverter(BaseUnitConverter):
"""Convert carbon monoxide ratio to mass per volume."""
"""Convert carbon monoxide ratio to mass per volume.
Using ambient temperature of 20°C and pressure of 1 ATM.
"""
UNIT_CLASS = "carbon_monoxide"
_UNIT_CONVERSION: dict[str | None, float] = {
CONCENTRATION_PARTS_PER_MILLION: 1,
# concentration (mg/m3) = 0.0409 x concentration (ppm) x molar mass
# Carbon monoxide molar mass: 28.01 g/mol
CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER: 0.0409 * 28.01,
CONCENTRATION_PARTS_PER_MILLION: 1e6,
CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER: (
_CARBON_MONOXIDE_MOLAR_MASS / _AMBIENT_IDEAL_GAS_MOLAR_VOLUME * 1e3
),
}
VALID_UNITS = {
CONCENTRATION_PARTS_PER_MILLION,