My thermodynamics says that you can measure the pressure by mass. Weight an empty tank and a full tank. The difference is the mass of the propane in there. Now comes some math... pressureXvolume=molesXgas constantXtemp you know v, n, r, and t. n=moles= mass of gas/formula weight of gas (propane is 44grams/mole) v=volume of the clinder. Lets say 1L R=gas constant=0.0821 L*atm/mol*Kelvin Temp=298K (or about room temp). So for 1000grams of gas, that corresponds to.... 556atm which is about 8173 psi. Yikes. that is high. Hmmm, somebody check my math here. This is for an ideal gas though.... Propane is NOT ideal, esp at high pressures. We'll need the van der waals equation for a better answer. But that gives you an idea that we have a lot of pressure here! ok, back to work m Matthew Pollard "Racing with the wind and flirting with death Dept. Of Chemistry So have a cup of coffee and catch your breath" University of Idaho www.uidaho.edu/~poll7356 |
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