why does a gas exert pressure
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Explanation:
Because gas has property to take space and gas has mass. So, can exert pressure
Example :
A balloon
In balloon we fill air and it can take space if we can tide the ballon and exert pressure on it then gas also exert pressure and if no space then it blast.
Answer:
The molecules are continually colliding with each other and with the walls of containers
when a molecule collide with wall,they exert small pressure on the wall the process exerted by the the gas is due to sum of all these collision force. The more particles that hit the wall the higher the pressure