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Question: What is Weight ?

Answer:

The weight of an object is the force of gravity on the object. This can differ from place to place. The size of the force which gravity exerts on a particular object. The same object on the moon's surface would weigh only one-sixth of its weight on the earth, while in an orbiting satellite it would be weightless.

The SI unit of mass (and hence weight in some everyday senses) is the kilogram. The SI unit of force (and hence weight in the mechanics sense) is the newton (N) - which can also be expressed in SI base units as kg m/s2 (kilograms times metres per second squared).