Which mixture is lighter than humid air ?

Warm air is lighter than cool air.

Carbon dioxide is lighter than air.

Ice is lighter than water due to

Ice is lighter than water due to

Ice is lighter than water due to

Which of the two is lighter : warm air or cold air ?

Describe an activity to demonstrate that warm air is lighter than cool air.

Give reason for the following: Although hydrogen is lighter than air it cannot be collected by downward displacement of air.