Advertisements
Advertisements
प्रश्न
What is evaporation ? State the various factors which affect evaporation.
उत्तर
Evaporation is the process by which a liquid changes into vapour form, below its boiling point. The factors that affect evaporation are:
- Temperature
- Surface area
- Humidity
- Wind speed
APPEARS IN
संबंधित प्रश्न
Why does a desert cooler cool better on a hot dry day?
Water in a dish evaporates faster than in a bottle. Give reason.
Which produces more severe burns : boiling water or steam ? Why ?
Define the following terms Condensation
Define the following term Freezing.
How can the evaporation of a liquid be made faster ?
Why does evaporation cool a liquid ?
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 ?
Comment on the following statements:
Rate of evaporation of an aqueous solution decreases with increase in humidity.
The rate of evaporation is more when the surface area is greater.
