Fill in the blank :
Heat transfer in liquids and gases is by ________.

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Solution

Heat transfer in liquids and gases is by convection.

Convection is the process of heat transfer by actual movement of medium particles. Convection can only transfer heat in liquids and gases because the particles in liquids and gases are free to move around.

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Fill in the blanks :

(a) Boiling occurs at ___

(b) Evaporation takes place at ___

(d) Heat is ___ during boiling.

(e) Cooling is produced in ___

(f) A longer rod expands ___ than a shorter rod on being heated to the same temperature.

(g) Liquids expand ___ than the solids.

(h) Gases expand ___ than the liquids.

(i) Alcohol expands ___ than water.

(j) Iron expands ___ than copper.

Name the general mode of heat transfer in [2 MARKS]
a) Solids
b) Liquids and gases.

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