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Question

When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

जब ऊष्मा को गर्म पिंड के एक कण से दूसरे कण में गर्म कणों की वास्तविक गति द्वारा स्थानांतरित किया जाता है, तो इसे ऊष्मा स्थानांतरण कहा जाता है।

A.

Conduction

B.

Convection

C.

Radiation

D.

Conduction and convection

Answer ( Option B)

Convection

Solution

Conduction:
  • Conduction is that mode of transmission of heat by which heat travels, through an unequally heated body, from the hot end to the cold end, from particle to particle, the particles themselves remaining at their mean positions.
  • Examples:
    Touching a hot pan and being burned
    Ice melting down your hand
    Boiling water by thrusting a hot piece of metal into it
Convection:
  • It is defined as that mode of transmission of heat by which heat travels from one part of a body to another by the actual motion of the heated particles of the body.
  • Examples:
    Hot air rising, cooling, and falling 
  • An radiator of old vehicles
Radiation:
  • It is defined as that mode of transmission of heat in which heat travels from the hot body to cold body in straight lines without heating the intervening medium.
  • Examples:
    Heat from the sun 
    Heat into the boiler
    Heat from a fire

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