Advertisements
Advertisements
प्रश्न
How does water kept in an earthen pot (matka) become cool during summer?
Advertisements
उत्तर
- An earthen pot has some pores through which the liquid inside it evaporates.
- This evaporation cools the water inside the pot, so water kept in an earthen pot becomes cool during the summer.
APPEARS IN
संबंधित प्रश्न
What type of clothes should we wear in summer?
Why is heat energy needed to melt a solid ? What is this heat energy called ?
Define the following terms Condensation
Why does all the water of the earth not get evaporated during hot summer days ?
Why are we able to sip hot tea or milk faster from a saucer rather than from a cup ?
The scientists now say that there are actually five states of matter A, B, C, D and E. The state A has a fixed volume but no fixed shape. The state B can be compressed very easily by applying pressure and state C has a fixed shape as well as a fixed volume. The state D is a mixture of free electrons and ions whereas state E is named after an Indian scientist and a famous physicist.
- Name the physical states (i) A (ii) B (iii) C (iv) D, and (v) E
- Name one substance belonging to state C which can directly change into vapours on heating. What is this process known as ?
- Name one substance which normally belongs to state B but whose solid form changes directly into gaseous state.
- Name the most common substance belonging to state A.
- Which state of matter makes the sun and other stars to glow ?
The ______ of air is dependent on the temperature of air.
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.
The process of evaporation is not a good technic to separate salt from seawater give a reason.
