DIFFERENCE BETWEEN HEAT AND TEMPERATURE

HEAT	TEMPERATURE
1. It is a form of energy and measures the total energy of all molecules in the substance.	1. It is a measure of degree of hotness or coldness of a body.
2. Its unit is joule in SI and calorie in CGS.	2. The unit of degree Celsius or Kelvin or degree Fahrenheit.
3. Two bodies can be in a thermal equilibrium without having equal thermal energy.  Their temperature are equal in case.	3. Two bodies cannot be in thermal equilibrium if they are at different Temperature.
4. Flow of heat doesn’t depend upon the heat energy contained in bodies in thermal contact.	4. Flow of heat depend upon the temperature difference between two bodies. Heat always flow from a body at higher temperature to a body at lower temperature.
5. It is a total kinetic energy of all molecules in a substance.	5. It is a measure of average kinetic energy of molecules in a substance.

Whether a body is hot or cold can

Be detected by touching it with our hands. But this judgment may be misleading. Consider an example. There are two buckets of water where one is slightly colder than other. When we put our hands separately into them one hand would fell cold and other would fell hot. Now take Third buckets of water with its temperature lying in between previous two. If we put both our hands into the buckets one would fell hot and other would feel cold.  Since the sensation given by our organ of sense may be misleading, we need an instrument to measure temperature objectively. This instrument is called thermometer.

There are many kinds of thermometer and their operation depends on some property of matter those changes with temperature. Most common thermometer is constructed on the expansion of a material with increase in temperature. The first thermometer was constructed using the idea of Galileo, using the principal of expansion of a gas. Nowadays, common thermometer consists of a hollow glass tube filled with mercury or alcohol. Some accurate thermometer is made using electrical properties of materials such as resistance thermometers, thermocouples and thermostats.