Question

Short Answer Type Questions:
Q.no.5. Why does our palm feel cold when we put some acetone on it?
Define boiling and melting point​

Answer 1

when we put acetone , petrol or perfume on our palm , it evaporates . During evaporation , perticles of the liquid absorb energy from the surface of the palm to compensate for the lose of energy , making the surrounding cool . hence it makes your palm cool

the boiling point of the substance is the temperature at which the vapour pressure of a liquid equals the pressure surrounding the liquid and the liquid change into vapour

Answer 2

Explanation:

Acetone,petrol and perfume are volatile substance that gets evaporated when they come in contact with air Evaporation is facilitated as it uses energy from the palm hence leaving a cooling effect on our palms.

when liquid starts boiling at a certain temp. then it is called boiling point.

when solid starts melting at a certain atmospheric pressure then it is

s called it's melting point.