Advertisements
Advertisements
प्रश्न
Why is heat energy needed to melt a solid ? What is this heat energy called ?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Why does a desert cooler cool better on a hot dry day?
How does water kept in an earthen pot (matka) become cool during summer?
Water in a dish evaporates faster than in a bottle. Give reason.
Why are we able to sip hot tea or milk faster from a saucer rather than from a cup ?
Why does evaporation cool a liquid ?
The evaporation of water increases under the following conditions :
The amount of vapour in 1 cu.m. of air shows the ______.
Give a geographical reason:
Air becomes saturated.
Look at Fig. 1.3 and suggest in which of the vessels A,B, C or D the rate of evaporation will be the highest? Explain.
The rate of evaporation is more when the surface area is greater.
