Question

Give reason
1) evaporation causes cooling....
2) sponge through compressible is a solid....
3) rate of evaporation of an aqueous solution decrease with increase in humidity...
Answer plz...

Answer 1

1) Evaporation causes cooling because the heat which is utilized in the process is taken from the object like when we sweat and when our sweat evaporates it takes heat from our skin thus decreasing the temperature of our body it causes cooling.

2)Sponge contains small pores in which air is trapped.On pressing, this air is expelled leaving the sponge compressible.It is a solid because it has a definite shape and volume and doesnot change its shape unless compressed.

3)The rate of evaporation at a given place is always dependent on the humidity of that place because if the air is already filled with water vapor, it will not have any place to hold excess vapor and therefore, evaporation will occur at an extremely slow rate.


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Answer 2

1) evaporation causes cooling as water vapour consumes the heat energy ost during evaporation2)sponge has air holes in its body and when it is compressed the air comes out3)rate of evaporation decreases with increase in humidity as there is no more space left over in the surroundings for the water to evaporate
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