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प्रश्न
Why is heat energy needed to melt a solid ? What is this heat energy called ?
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उत्तर
Heat energy is needed to melt a solid because heat energy increases the kinetic energy of particles, which is sufficient enough to break the attraction or bond between the particles and they start moving faster. As a result, there is a change in the state of matter from solid to liquid.
This heat energy is called latent heat of fusion.
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संबंधित प्रश्न
A liquid can change into vapour state at all temperatures.
State three factors which affect the rate of evaporation of a liquid.
Water in a dish evaporates faster than in a bottle. Give reason.
Why is cooling produced on evaporation of a liquid?
Explain with an example to demonstrates that when a liquid evaporates, it takes heat from its surroundings.
How will you demonstrate that water vapour is present in air ?
Why does evaporation cool a liquid ?
The evaporation of water increases under the following conditions :
Give a geographical reason:
Air becomes saturated.
The process of evaporation is not a good technic to separate salt from seawater give a reason.
