Question

Why do gases have neither a fixed shape nor a fixed volume?

Answer 1

It's because the molecules have a larger distance between them compare to solid or liquid and cause of their kinetic energy they move randomly here and there which simply results in their irregular shape and volume.

Answer 2

HELLO FRIENDS ,
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The gases donot have fixed shape as well as fixed volume because the molecules of gases have very less inter-molecular forces between them , so the molecules of gases are free to move in surroundings and also they can't be compressed due to less inter-molecular force .
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Best of luck ;)
ROYALJATT