Fahrenheit.
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For common weather measurements Fahrenheit is used in the US. For scientific purposes both the Fahrenheit and the Celsius scale are used.
It is the metric or SI scale for linear measurement.
A hectoliter is a unit of measurement. This particular unit of measurement is used for the volume of liquids on a large scale.
Kelvin is an absolute scale, which makes much more sense once you understand that temperature is related to the speed of atoms (they can't have a negative speed). An absolute scale is one in which the lowest possible temperature is zero. An absolute scale also makes more sense in thermodynamics, where the ratios between two temperatures are often important.
When you are in the US or its territories.