Heat

Heat is a form of energy that can only be felt .Heat flows from hotter region to colder region due to the difference in the temperature .Heat is measured in calories or joules .The SI unit of heat is joule, which is represented as ‘J’ .The heat is mostly absorbed by black colour and reflected by white colour .

To state whether a body is hot or cold,there always has to be a reference body with respect to which we can say whether a given body is hot or cold .

Temperature is the degree of hotness or coldness of a body or place .It is measured with an instrument called thermometer .The SI unit of the temperature is kelvin

Thermometer

A thermometer is a kind of glass like rode consists of mercury or alcohol(inside) .This device is used to measure the temperature of an object.

Transfer of heat

The transfer of heat is done by the three ways: Conduction,Convection and Radiation .

Conduction:

This mode of transfer of heat is mainly done in solids .

Convection:

This mode of transfer of heat is mainly done in liquids .

Radiation:

This mode of heat requires no medium and is done in gas and also able to happen in vacuum .