Question

answer this question

Answer 1

ANSWER :-
d) we can easily move our hand in air becoz the air is lighter and not so strong like a wind, so we need not to push it with brute force and we can wave our hand easily.
but for breaking the block of wood we need to be strong enough to break it and we should be an expert in karate.

a) as gas is lighter compared to the vessel, it occupys the total space available in the vessel and it easily fills.

b) yeah. gas exerts pressure everywhere because air(gas) is present everywhere. it also exerts pressure on us.
it can be proved by the following activity :-