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#289828
Frank Hiebert
Participant

First of all it must be stated that pressure is force restricted to a unit area. The formula is Pressure = density height. It makes no difference how much volume of water you have in your tank, whether it be rectangular or cylindrical. What we are concerned with is the height and density of the medium, which I am assuming is water. 1 ft water column produces .434 psi(pounds per square inch). By simply multiplying .434 psi 10 ft we get a pressure of 4.34 lbs/square inch. Thus the pressure exerted at the bottom of your tank is 4.34 pounds per square inch. If it was a million gallon tank with a height of 10 feet the answere would still be the same. Force however is defined as a simple push, pull or weight. Force = Area pressure. So if your tank is cylindrical the area on the bottom would be 3.14 times the radius squared = 3.14 square feet, or about 452 square inches. So then Force = 452 square inches 4.34 lbs/square inch which gives a force of aproximatly 1,962.5 lbs. exerted on the bottom of the tank by the water. Don’t confuse force and pressure with weight. If it is simply weight you are looking for, the capacity of your cylindrical tank would be 31.4 cubic feet. One cubic feet of water weighs 62.5 lbs thus you can hold 1,962.5 lbs of water in your tank. Notice how the weight and force are the same here, they aren’t always, it depends on the shape of the container….. thats why I showed you . Hope somewhere in here you find the answere you were looking for. Keep in mind these numbers have been rounded off a little and I am basing these calculations at standard temperature and pressure.

Frank Hiebert
3rd yr apprentice
Edmonton, Alberta

Now a little note for 4th year;