Reply To: Pipe testing

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“Stick a needle in a balloon filled with air and it explodes. Stick a needle in a balloon filled with water and a small stream of water comes out.”
Not if they both have equal pressures inside the vessel. Then the force exerted against the plastic is equal in all directions in both cases, as opposed to one under say 10psi of air pressure in all directions and the other held in your hand filled with water, the pressure being exerted mostly down because of gravity pulling the water therefore the pressure inside is not equal in all directions. Sit a balloon on the ground and pressurise it with water, equal to the air filled one (not just fill it) and then stick a pin in it, then balloon will exploded. Have to admit that I didnt notice Michael Labbe say the pipe was plastic

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