CBSE Class 7 Answered
Explain the process of conduction,convetion and radiation?
Asked by koyeliaghosh | 30 Sep, 2020, 03:26: AM
Expert Answer
Conduction: -
Conduction is the process by which heat is transferred from the hotter end of an object to the colder end of the object.
Materials which allow heat to pass through them easily are called conductors.
o Metals are good conductors of heat. o Examples: Aluminium, iron, copper, silver etc.
Convection:-
Convection is the transfer of heat by the movement of particles of a medium from one place to another.
It occurs only in liquids and gases.
Examples: Wind currents, the lower floor of a building is cooler than the upper floor, and the atmosphere at the seashore is always pleasant because of convection.
Radiation:-
Radiation is the transfer of heat which does not require a medium.
All hot bodies emit heat by the process of radiation.
We get heat from the Sun because of radiation as there is no medium present between the atmosphere of the Earth and the Sun.
Examples: o When we sit near a room heater, we get warmth by the process of radiation. o A hot utensil kept away from the flame cools down as it transfers heat to the surroundings by radiation.
o Our body produces heat and receives heat from the surroundings by radiation.
Answered by Shiwani Sawant | 30 Sep, 2020, 11:22: AM
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