Advertisements
Advertisements
प्रश्न
Why do we feel much comfortable when we sit under a moving fan especially when our body is sweating?
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.
APPEARS IN
संबंधित प्रश्न
Write the approximate value of specific latent heat of ice.
1 g ice of 0℃ melts to form 1 g water at 0℃. State whether the latent heat is absorbed or given out by ice.
Explain the following:
The surrounding become pleasantly warm when water in a lake starts freezing in cold countries.
Explain the following:
The heat supplied to a substance during it change of state, does not cause any rise in its temperature.
A thermally insulated pot has 150 g ice at temperature 0°C. How much steam of 100°C has to be mixed to it, so that water of temperature 50°C will be obtained? (Given : latent heat of melting of ice = 80 cal/g, latent heat of vaporization of water = 540 cal/g, specific heat of water = 1 cal/g °C)
When a liquid is getting converted into solid, the latent heat is ………………………………
What is the name given to the energy absorbed during a phase change?
When 1 g of ice at 0 °C melts to form 1 g of water at 0 °C then, is the latent heat absorbed by the ice or given out by it?
State the main precautions to be taken in finding the latent heat of steam.
What observation you will record and how will you determine the specific latent heat of fusion of ice?
1 kg of water is contained in a 1.25 kW kettle. Assuming specific heat capacity of water = 4.2 J/g °C and specific latent heat of vaporization = 2260 J/g, calculate:
(i) the time taken for the temperature of water to rise from 25°C to its boiling point,
(ii) the mass of water which evaporates per minute from the boiling water.
If pressure increases, the melting point of a substance ______.
Find the odd one out and give its explanation.
Write the name.
Products obtained when sugar is heated.
Write scientific reason.
The bottom of some steel utensils used for cooking is copper.
Specific latent heat L = ______.
Calculate the amount of heat required to convert 200g of ice at 0°C into the water at 0°C Specific latent heat of fusion of ice = 336 Jg-1
2875 J of heat is required to melt 115 g of lead at its melting point. Calculate the specific latent heat capacity of fusion of lead.
Specific latent heat of a substance ______.
