Acceleration due to gravity (g)

The rate at which a falling body gains speed. The acceleration due to gravity is 32 ft/sec/sec. This simply means that a falling body or fluid will increase the speed at which it is falling by 32 feet/sec every second that it continues to fall.


Source: Handbook of water and wastewater treatment plant operations

Wikipedia:  https://en.wikipedia.org/wiki/Gravitational_acceleration