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Why Do We Feel Much Comfortable When We Sit Under a Moving Fan Especially When Our Body is Sweating? - Physics

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प्रश्न

Why do we feel much comfortable when we sit under a moving fan especially when our body is sweating?

टीपा लिहा

उत्तर

The reason is that sweat from our body evaporates faster under a moving fan due to rapid movement of air and so a cooling sensation is caused which makes us more comfortable.

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पाठ 10: Specific Heat Capacity and Latent Heat - Short Answers

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आईसीएसई Physics [English] Class 10
पाठ 10 Specific Heat Capacity and Latent Heat
Short Answers | Q 66

संबंधित प्रश्‍न

What is the energy absorbed during the phase change called?


Write the approximate value of specific latent heat of ice.


Liquid ammonia is used in ice factory for making ice from water. If water at 20°C is to be converted into 2 kg ice at 0°C, how many grams of ammonia are to be evaporated? (Given: The latent heat of vaporization of ammonia = 341 cal/g)


When a liquid is getting converted into solid, the latent heat is  ………………………………


Is heat a form of energy?

A substance changes from its solid state to the liquid state when heat is supplied to it. What name is given to heat absorbed by the substance.


Explain why water is used in hot water bottles for fomentation and also as a universal coolant.


What happens to the heat supplied to a substance when the heat supplied causes no change in the temperature of the substance?


Why does evaporation causes cooling and why is water used in hot water bottles?


Explain the meaning of greenhouse effect.


State the main precautions to be taken in finding the latent heat of steam.


Calculate the total amount of heat required to convert 100g ice at 0°C to steam at 100°C. 
(Specific latent heat of fusion of ice = 336 J/g, specific latent heat of vaporization of steam = 2260 J/g, specific heat capacity of water = 4.2 J/g°C).


How fog is formed?


Write the name.

Products obtained when sugar is heated.


1 kg of dry air at a temperature of 40 °C can hold a maximum of 49 g of water vapour.


Write scientific reason.

Use a pressure cooker to cook food in cold air.


Calculate the total amount of heat energy required to melt 200 g of ice at 0°C to water at 100°C. (Specific latent heat of ice = 336 Jg-1, specific heat capacity of water = 4.2 Jg-1 °C-1)


Observe the following graph and answer the following questions:

  1. What does the graph represent? 
  2. What does the line AB represent?
  3. What does the line BC represent?

20 g of ice at 0°C absorbs 10,920 J of heat energy to melt and change to water at 50°C. Calculate the specific latent heat of fusion of ice. Specific heat capacity of water is 4200 J kg-1 K-1.


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