High Quality Content by WIKIPEDIA articles! The weight in a given frame of reference is a generalized concept of weight, see the ISO definition of weight. An object's regular weight is its weight with respect to Earth. An object's weight with respect to, for example, an accelerating elevator is different: if the elevator accelerates upward, objects feel heavier and seem to fall faster. In certain contexts the phrase apparent weight may either mean the same, or be affected by external forces other than gravity, for example making it zero in the case of levitation. The ISO standard ISO 80000-4 (2006) defines weight as follows "The weight of a body in a particular reference frame is the force that gives the body an acceleration equal to the local acceleration of free fall in that reference frame."

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