is a measure of hotness or coldness of a physical object with reference
to some standard value. Similar to pressure or density, it is an intensive
property. Meaning that it does not change as the amount of matter changes.
originally based its 0° value as the freezing temperature of a solution made
from a mixture of water, ice, and ammonium chloride. But today, it's defined by
two fixed points, the freezing point
and the boiling point
is a unit of temperature on the Celsius scale, a temperature scale originally
known as the centigrade scale. It's a linear scale based on
for the freezing point of water and
for the boiling point of water.