Question

describe some applications of conductivity in daily life.​

Answer 1

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• (I) In winter, a metallic handles appears colder than the wooden door.

In winter, the human body is at Higher temperature than the surrounding objects. As we touch the metallic handle heat flows from our body to the handle and feels cold. But no heat flows from our body to the wooden door so it does not feel that cold as the metallic handle.

• (ii) Cooking utensils are provided with wooden handles.

Wood is a bad conductor of heat. a wooden handle does not allow it to be conducted from the hot utensils to the head. So we can easily hold hot utensils with the help of wooden handles.

• (iii) A new quilt is warmer than the old quilt.

A new quilt contains more air in its pores as compared to the old quit. As air is a bad conductor of heat it does not allow it to be conducted away from the body to the surroundings and we feel warmer in it.

• (iv) Birds swell their feathers in winters.

By doing so the words enclose air between their feathers and the body. Air is a poor conductor of heat. It prevents the loss of heat from the bodies of the birds to the surrounding and as such they do not feel cold in winter .

• (v) Ice is saw in saw dust.

Saw dust and air trapped inside it are poor conductors of heat. This prevents the conduction of heat from the surroundings to the ice which may otherwise melt the ice.

• (vi) A Refrigerator is provided with insulated walls.

Generally, Fibre glass is used as an insulating material. this is done to minimise the chances of heat flowing into the refrigerator from outside.

Answer 2

Hlo mate ❤️

• Thermal conductivity is actually about the conduction of heat or transfer of heat. 2) Pouring of hot tea in a cup will make the cup of the also warm because of the heat transfer from tea to the cup. 3)Transfer of heat from iron to shirt while pressing is also a good example
• A good example would be heating a tin can of water using a Bunsen burner. Initially the flame produces radiation which heats the tin can. The tin can then transfers heat to the water through conduction. The hot water then rises to the top, in the convection process.

mark me dr❤️