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(millimeter per hour) per second is a unit of acceleration. It is equal to 2.77777778 × 10-7 m / s2. Plural name is (millimeters per hour) per second.
The standard acceleration due to gravity (or standard acceleration of free fall), sometimes abbreviated as standard gravity, usually denoted by ɡ0 or ɡn, is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth.