Question

place few drops of hand sanitizer on your palm, you feel cool, why?​

Answer 1

Sanitizer when put on our palm starts to evaporate due to the latent heat present on our palm . When any substance evaporates ; the liquid particles absorbs energy from the surroundings . As the substance is already losing heat through evaporation and gaining energy through the surroundings and also our palm ; that area starts feeling cold.

The same happens when acetone or perfume are put on our hands.

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$\large{\underline{\sf{Evaporation :}}}$

The process by which a liquid converts into gaseous state is known as evaporation.

$\large{\underline{\sf{ Latent \: Heat :}}}$

Latent heat is the amount of heat required to change the state of a substance.

If it is change from liquid to gas : Latent heat of vaporisation.

If it is change from solid to liquid : Latent heat of fusion.