In a message dated 4/10/2002 8:19:16 PM Central Daylight Time, coalbunny@onewest.net writes: << I would presume that a pressure chamber could be made by using compressed air to add weight to the water. Am I wrong on that? >> Why would you even have to use water. Pounds per square inch is the same whether it's air or water. Why not just use compressed air if testing for crush pressure. Mark