Enum - Unit

Key: enum.unit

Represents a physical unit of measurement. Used as unitFrom and unitTo in calorific value and emission factor conversion coefficients, and as invoiceValue.unit. Stored as an integer in the database. Carried over from EM2 Units constants.

CO₂ convention: Emission factors typically use unitFrom = KWH (or MWH / GJ) and unitTo = T (tonnes of CO₂ equivalent). Calorific value conversions typically use unitFrom = M3 or KG and unitTo = KWH or GJ.

Values

Integer value	Constant name	Symbol	Description
1	M3	m³	Cubic metres — volume measure for gas, water.
2	KWH	kWh	Kilowatt-hours — energy.
3	MWH	MWh	Megawatt-hours — energy.
4	GJ	GJ	Gigajoules — energy.
5	T	t	Tonnes — mass (solid fuels, CO₂ equivalent).
6	L	l	Litres — volume (liquid fuels).
7	KG	kg	Kilograms — mass.
8	DEGREE_C	°C	Degrees Celsius — temperature.
9	PERCENTAGE	%	Percentage.
10	PPM	ppm	Parts per million — concentration (CO₂ sensors).
11	KC	Kč	Czech crowns — currency, used for invoiced cost figures. Corresponds to EM2's constant value 99; renumbered here to keep the sequence contiguous, since EM3 is a fresh schema with no need to preserve EM2's arbitrary integer values.

References

• Calorific-value conversion entity — .unitFrom / .unitTo
• Emission-factor conversion entity — .unitFrom / .unitTo
• invoiceValue.unit