Thread: Most Powerful FIRST Team created T-Shirt Cannon
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Unread 22-05-2010, 12:31
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Re: Most Powerful FIRST Team created T-Shirt Cannon
Quote:
Originally Posted by iCurtis View Post
What is the difference between gas pressure and liquid pressure? If they are both Force/Area, how do they make the material fail in one case, and not in the other? Does it have something to do with the rate of expansion of a gas vs. a liquid?
From another thread:
Quote:
Originally Posted by Daniel_LaFleur View Post
Lets consider PVCs pressure rating for a moment. PVC is only pressure rated for liquids (and for a very good reason):
Water is incompressable, much like a steel block ... if you push down on a steel block with 50 PSI it will not compress and if you release that force instantly the steel block will not move.
Air, on the other, hand is compressable, like a 50 pound spring. Apply 50 psi to it and the sprin compresses. release that force instantly and the spring not only goes back to it's original shape but rockets off of the surface it was on.