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.
is similar to the Kelvin scale in that it starts at absolute zero and
0°R is the same as 0K (Kelvin) but is different as a change of 1°R
is the same as a change of 1°F and not 1°C (Celsius).
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.