Explain the following: a) Cooling is caused by evaporation. b) Honey diffuses very slowly in water. c) We feel uncomfortable when humidity is very high. d) Clothes dry faster on a windy day.
Answers
1)During evaporation particles of the liquid gain energy from the surroundings to overcome the force of attraction between them. As a result loss of heat energy occurs in the surroundings that is why evaporation causes cooling .
2) The honey diffuses in water at a slower rate than ink because the density of honey is higher than that of ink and its viscosity is also higher than that of ink. Ink is made up of small particles and it occupies the space in between the water molecules.
3) Humidity is uncomfortable because it holds moisture to our bodies, not allowing us to cool. ... Normally, this wet (and stinky) process is the body's way of cooling itself off, but when high humidity turns that heat sticky, you can start to feel uncomfortable because the sweat has nowhere to go.
4) Evaporation increases with increase in wind speed. With the increase in wind speed, the particles of water vapour move away with the wind, decreasing the amount of water vapour in the surrounding. Hence, clothes dry faster on a windy day.
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Explanation:
a. Evaporation causes cooling because the process requires heat energy. The energy is taken away by the molecules when they convert from liquid into gas, and this causes cooling on the original surface.
b.The honey diffuses in water at a slower rate than ink because the density of honey is higher than that of ink and its viscosity is also higher than that of ink. Ink is made up of small particles and it occupies the space in between the water molecules.
c.Humidity is uncomfortable because it holds moisture to our bodies, not allowing us to cool. ... Normally, this wet (and stinky) process is the body's way of cooling itself off, but when high humidity turns that heat sticky, you can start to feel uncomfortable because the sweat has nowhere to go.
d.Evaporation increases with increase in wind speed. With the increase in wind speed, the particles of water vapour move away with the wind, decreasing the amount of water vapour in the surrounding. Hence, clothes dry faster on a windy day.