Physics
The rate of evaporation of a liquid increases when:
- temperature of liquid falls
- liquid is poured in a vessel of less surface area
- air is blown above the surface of liquid
- humidity increases
Heat Energy
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Answer
air is blown above the surface of liquid
Reason — Blowing air above the surface of liquid takes away the molecules escaping from liquid surface and to take their place other molecules move to the surface of liquid thus increasing evaporation rate.
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Related Questions
In evaporation:
- all molecules of liquid begin to escape out
- only the molecules at the surface escape out
- the temperature of liquid rises by absorbing heat from surroundings
- the molecules get attracted within the liquid
During boiling or vaporization:
- all molecules take part
- temperature rises
- no heat is absorbed
- the average kinetic energy of molecules increases
The boiling point of a liquid is increased by:
- increasing the volume of liquid
- increasing the pressure on liquid
- adding ice to the liquid
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Two rods A and B of the same metal, but of length 1 m and 2 m respectively, are heated from 0°C to 100°C. Then:
- both the rods A and B elongate the same
- the rod A elongates more than the rod B
- the rod B elongates more than the rod A
- the rod A elongates, but the rod B contracts