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प्रश्न
During summer, water kept in an earthen pot becomes cool because of the phenomenon of
विकल्प
diffusion
transpiration
osmosis
evaporation
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उत्तर
evaporation
During summer, water kept in an earthen pot becomes cool because of the phenomenon of evaporation. Earthen pot has a large number of tiny pores in its walls and some of the water molecules continuously keep seeping through these pores to outside the pot. This water evaporates continuously and takes the latent heat required for vaporization from the remaining water. In this way, the remaining water loses heat and gets cooled.
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संबंधित प्रश्न
State the boiling point of water.
A certain quantity of water is heated from 20°C to 100°C. Its temperature is recorded after each 1 minute. The observations are:
| Time (in minute) | Temperature (in °C) |
| 0 | 20 |
| 1 | 30 |
| 2 | 40 |
| 3 | 50 |
| 4 | 60 |
| 5 | 70 |
| 6 | 80 |
| 7 | 90 |
| 8 | 100 |
| 9 | 100 |
| 10 | 100 |
| 11 | 100 |
| 12 | 100 |
It is difficult to cook vegetables on hills and mountains. Explain the reason.
A pressure cooker is based on the principle that boiling point of water increases with the ______.
Assertion: The process of conversion of liquid water to its vapours by heating the liquid is called boiling.
Reason: The process of conversion of water vapours to liquid by cooling the vapours is called condensation.
What is the physical state of water at 100°C.
____________ is the change of solid state directly to vapour state without going through the ____________ state.
The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called ____________.
Why does the temperature of a substance remain constant during its melting point or boiling point?
We would have observed that the plate that covers the cooked food items has water droplets inside. Why? Explain.
