BASICS OF HEAT TRANSFER

Difference between heat and temperature
In heat transfer problems, we often interchangeably use the terms heat and temperature. Actually,
there  is  a distinct difference between the two. Temperature is  a measure of the amount of energy
possessed by the molecules of a substance. It manifests itself as a degree of hotness, and can be used
to predict  the  direction of heat  transfer.  The  usual  symbol for temperature  is T. The  scales  for
measuring temperature in SI units are the Celsius and Kelvin temperature scales. Heat, on the other
hand, is energy in transit. Spontaneously, heat flows from a hotter body to a colder one. The usual
symbol for heat is Q. In the SI system, common units for measuring heat are the Joule and calorie.