Advertisements
Advertisements
प्रश्न
Why does weather become pleasant when it starts freezing in cold countries?
उत्तर
Ice has the highest sp. latent heat of fusion of 336,000 jkg-1. Thus, every 1 kg of water at 0°C, on freezing releases 336,000 J of heat energy. As enormous amount of heat energy is released in atmosphere, therefore weather becomes pleasant.
APPEARS IN
संबंधित प्रश्न
What is the energy absorbed during the phase change called?
Write the approximate value of specific latent heat of ice.
- Which requires more heat: 1 g ice at 0℃ or 1 g water at 0℃ to raise its temperature to 10℃?
- Explain your answer in part (a).
Give one consequence of the high specific latent heat of fusion of ice.
Why water get cooled in a ‘Surahi’ in hot season?
Define the term ‘specific latent heat of fusion’ of a substance.
The specific latent heat of vaporisation of steam is 2260 J/g. Comment on this.
Explain, why no tracks are left on the ice during ice skating?
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.
Define boiling point of a liquid.
Match the columns.
| Column A | Column B |
| 1) Specific latent heat of fusion | a) Air saturated with vapour |
| 2) Specific latent heat of vaporisation | b) Solid converts into liquid |
| 3) Dew point temperature | c) liquid converts into gas |
Write the name.
Products obtained when sugar is heated.
During reheating, ice is converted to water at a temperature of 0 °C.
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)
