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Potential energy
(PE) is defined as the energy of position. Using English system units, it is defined by Equation 1-11. 
In most practical engineering calculations, the acceleration due to gravity (g) is numerically equal to the gravitational constant (gc); thus, the potential energy (PE) in foot-pounds-force is numerically equal to the product of the mass (m) in pounds-mass times the height (z) in feet above some reference level. Example:
Determine the potential energy of 50 lbm of water in a storage tank 100 ft above the ground. Solution:
Using Equation 1-11 
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