Question

Pressure_____ if the magnitude of force decreases.
Why is the cooling unit of a refrigerator made at the top?
Define a molecule.

Answer 1

(i)-

Decreases

(ii)-

The cooling unit of a refrigerator made at the top because the cold air is heavier and denser. The warm air is lighter and less denser than cold air So the cold air moves in downwards direction and the warm air moves in upward direcation.

(iii)-

Molecule is a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.