Add comment on conversion factor for Carbon monoxide on dependency molecular weight (#152535)

2025-09-18 15:36:12 +02:00 · 2025-09-18 15:36:12 +02:00 · 472d70b6c9
parent 017a84a859
commit 472d70b6c9
1 changed files with 3 additions and 1 deletions
--- a/homeassistant/util/unit_conversion.py
+++ b/homeassistant/util/unit_conversion.py
@ -174,7 +174,9 @@ class CarbonMonoxideConcentrationConverter(BaseUnitConverter):
    UNIT_CLASS = "carbon_monoxide"
    _UNIT_CONVERSION: dict[str | None, float] = {
        CONCENTRATION_PARTS_PER_MILLION: 1,
-        CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER: 1.145609,
+        # concentration (mg/m3) = 0.0409 x concentration (ppm) x molecular weight
+        # Carbon monoxide molecular weight: 28.01 g/mol
+        CONCENTRATION_MILLIGRAMS_PER_CUBIC_METER: 0.0409 * 28.01,
    }
    VALID_UNITS = {
        CONCENTRATION_PARTS_PER_MILLION,