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प्रश्न
Water in a dish evaporates faster than in a bottle. Give reason.
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उत्तर
Rate of evaporation is more when the area of the exposed surface is more. As area exposed in a dish is more, evaporation is also more.
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संबंधित प्रश्न
What produces more severe burns, boiling water or steam?
What is evaporation?
Give two applications of evaporation.
Explain why in hot summer days water remains cool in earthen pots.
How will you demonstrate that water vapour is present in air ?
Why does evaporation cool a liquid ?
During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of :
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 ?
Why is the air in a region dry?
The rate of evaporation ______ with rising temperature.
