I am looking to do the following calc but I am getting frustrated with applying the correct units. I want the result to be in "pounds per gallon i.e. ppg or lb/gal".
Pressure is in psi, Depth is in ft, and the 0.052 is a conversion factor derived from converting the following:
1 gallon = 231 cubic inches
1 foot = 12 inches
12/231 = 0.052 however i am finding it difficult to substitute the conversions into the formula. HELP!
You don't mean lb (pound, a mass) but rather lbf (pound(force), the corresponding wight, a force, = mass times constant of gravity)!
You don't have to bother with conversion factors as Prime can deal pretty good with units and knows a lot of them.
I assume you are using Prime (version 10 or below) and not real Mathcad (version 15 or below), but of course this applies to Mathcad as well.
So in your calculations you can use any units you like - Prime will take care of any conversions necessary. For example
If you display the result, Prime will use base units, dependent on the unit system you have chosen for the sheet (SI, UCS or CGS).
If you have chosen UCS, you would see
but you can edit the units at your will and Prime will take care of any conversions necessary
Prime also has some units for force density predefined, pci (pound(force) per cubic inch) and pcf (pound(force) per cubic feet)
But ppg is unknown to Prime. But feel free to define it yourself as unit anywhere in the sheet before you first use it (maybe in a collapsed area at the top of the sheet or at the right non printable area out of sight.
If you still have any questions feel free to ask.
Prime 10 sheet attached
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