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Why is gravitational potential energy not included within the equation for energy conservation?

Why is gravitational potential energy not included within the equation for energy conservation?

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Answer #1

Whenever in solving a system of energy, if gravitational potential energy is not included in the energy conservation equation, is should be due to the fact that system always remains at the same height and hence its gravitational potential energy does not vary. In that case, we do not require this part to be added.

Also, in a few systems, the change in gravitational energy may be neglected when it is negligible compared to other sources of energy. For example a dilute gaseous fow through a pipe undergoing chemical reaction. Im this case, chemical energy release is very high compared to the negligible amount of gravitational potential energy of the gas having a very small mass.

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