Question

Why do we feel cold, when we keep acetone and ether on our palm?

Answer 1

Hint: We can relate the cooling effect of the acetone and ether on the palm by the nature of the compounds, the boiling point of the compounds, and the latent heat of vaporization. This process can also be called the endothermic process.

Complete answer:
There are many types of compounds that can be converted into vapors. So, there are two types of compounds, i.e., volatile compounds and non-volatile compounds. Volatile compounds are those which have a high chance of converting into vapor form and non-volatile compounds are those which cannot be easily converted into vapor form.
We can relate the cooling effect of the acetone and ether on the palm by the nature of the compounds, the boiling point of the compounds, and the latent heat of vaporization. So, both acetone and ether are volatile compounds, they have low boiling points and they have low latent heat of vaporization.
So, when we keep acetone and ether on our palms, then these compounds take energy from the surrounding. Due to this energy from the surrounding, acetone and ether will start to vaporize and convert into gaseous form. When the vapors are formed there is a cooling sensation in our surroundings and our palm feels cold. Since there is a drop in the temperature of the surrounding we can also say that this process is an endothermic process.

Note:
Not only acetone and ether, but perfumes also have this property. That is why when we apply perfume to our bodies, we feel cold. Some other examples that have this property are petrol, gasoline, etc.