Advertisements
Advertisements
प्रश्न
What produces more severe burns, boiling water or steam?
Advertisements
उत्तर
- The intensity of burns in steam is more than that in boiling water because the particles present in steam have more energy than the particles present in water.
- This extra energy is in the form of latent heat due to which they generate more heat. As a result, more burns are felt on the skin due to steam.
संबंधित प्रश्न
What type of clothes should we wear in summer?
Give two applications of evaporation.
How will you demonstrate that water vapour is present in air ?
The evaporation of water increases under the following conditions :
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 ?
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.

Comment on the following statements:
Evaporation produces cooling.
Comment on the following statements:
Rate of evaporation of an aqueous solution decreases with increase in humidity.
The process of evaporation is not a good technic to separate salt from seawater give a reason.
