The<unk>  or<unk> me (symbol:<unk> g) is the base unit of mass in the International System of Units <unk> nown also by its French-language initials “SI”). The<unk>  is defined as being equal to the mass of the International Prototype<unk>  (IPK;<unk> nown also by its French-language name Le Grand<unk> , which is almost exactly equal to the mass of one liter of water. It is the only SI base unit with an SI prefix as part of its name. It is also the only SI unit that is still defined in relation to an artifact rather than to a fundamental physical property that can be reproduced in different laboratories.
In everyday usage, the mass of an object in<unk> s is often referred to as its weight, although strictly speaking the weight of an object is the gravitational force on it, measured in newtons (see also<unk> -force). Similarly, the avoirdupois pound, used in both the Imperial system and U.S. customary units, is a unit of mass and its related unit of force is the pound-force. The avoirdupois pound is defined as exactly 0.45359237<unk> g, making one<unk>  approximately equal to 2.205 avoirdupois pounds.
Many units in the SI system are defined relative to the<unk>  so its stability is important.  After the International Prototype<unk>  had been found to vary in mass over time, the International Committee for Weights and Measures <unk> nown also by its French-language initials CIPM) recommended in 2005 that the<unk>  be redefined in terms of fundamental constants of nature.
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