When, some drops of nail polish remover fall on your palm, the cooling sensation is a result of which of the following phenomenon:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Evaporation
Evaporation is the change of a liquid into vapour at its surface, below its boiling point. To change into vapour, a liquid needs heat (its latent heat of vaporisation), and it takes this heat from whatever it touches. Nail polish remover is mostly acetone, which evaporates very quickly, so it draws heat from the palm in a short time and the palm feels cold.
Why the other options are incorrect
Option (1) Perspiration — Incorrect. Perspiration is sweating, the body giving out sweat through the pores of the skin.
Option (2) Precipitation — Incorrect. Precipitation is water falling from clouds as rain, snow, sleet or hail.
Option (4) Condensation — Incorrect. Condensation is vapour turning into liquid, which gives out heat instead of taking it.