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Unread 23-05-2010, 01:13
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Re: Most Powerful FIRST Team created T-Shirt Cannon

Quote:
Originally Posted by efoote868 View Post
By definition, liquid water isn't compressible (liquids have a definite volume). Since water doesn't violently expand or change shape when its depressurized, there is no chance that it'll take the plastic with it.
Last I checked, liquid water IS compressible, just very little. Heck, a solid steel block is compressible, you just need to apply enough pressure

Call me a bit of a n00b, but I'm not sure I see the difference between water pressure and liquid pressure, PSI is PSI, no matter what is CREATING the pressure on the walls of the PVC, the pressure is still there, and (assuming it is regulated) the same amount in both cases.
I understand that the PVC wouldn't be safe in this situation, I just don't really understand the difference between the ratings (liquid vs. air)...