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A temperature scale is a scale of degrees that measure at least one physical attribute of a known substance. The two most commonly employed physical attributes of substances used to establish temperature scales are boiling point and freezing point. The boiling point of a substance is the point at which its molecules convert from the liquid phase to the gaseous phase, while the freezing point is the point at which a liquid phase of a substance converts to the solid phase of the substance. Water, for example, has a freezing point of 0 degrees on the Celsius scale, 32 degrees on the Fahrenheit scale. Water also has a boiling point of 100 degrees on the Celsius scale, while it boils at 212 degrees on the Fahrenheit scale. These two sets of numbers show the range that water occupies as a liquid phase of matter. Between the two, the Celsius 0 to 100 degrees is generally easier to work with than the Fahrenheit 32 to 212 degrees.
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