Question

name the component(s) of air present in variable amount.

Answer 1

The composition of air consists of three key components of air, namely Nitrogen (78%), Oxygen (21%), Argon (1%), Carbon-di-oxide (0.03%) and water vapor. Air also has some other gases but they are in very minute percentage.

Answer 2

Components of air present in 'variable amount' are water vapour, dust particles and pollen grains.

They don't have any fixed composition like that of gases.