In most of science it is the Celsius degree. There are 100 of these degrees between the freezing point and boiling point of water at standard pressure (sea level). The other common or customary unit is the Fahrenheit degree. There are 212 of these degrees between the freezing and boiling points of pure water at standard atmospheric pressure.
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Fahrenheit, if you're talking about U.S. Customary units.
Cm
Hectares.
Probably the cubic megaparsec.
In most countries, it is customary to measure that in liters.