Weight

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In common language, weight refers to the mass of a body, however, in physical terms it means the force on a body due to the earth's gravity, usually denoted by "Fg" or "Fw" or just "F" like any other force. It is equal to:

F_g = m\cdot g

Where g is a "constant" -- it is approximately equal to 9.80665 m/s2 at sea level at a latitude of 45.5°. Because of the oblateness of the Earth (which results in a slightly greater distance between the earth's surface and its center, at latitudes closer to the equator) one is advised to go to the equatorial regions if one wishes to lose "weight".

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