Which of following process is in work in phenomenon of 1 boiling of water 2 drinking coffee where st...........

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Which of following process is in work in phenomenon of

(1)boiling of water.

(2) drinking coffee where steam rises upwards.

(3)using a fan to cool off the body.

(4)heating a room during the cold season.

Convection

Conduction

Radiation

None of above

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Explanation:

Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it. Convection above a hot surface occurs because hot air expands, becomes less dense, and rises. Hot water is likewise less dense than cold water and rises, causing convection currents which transport energy.