Mass is not weight.....Weight is the pull of gravity -the downward force exerted by the earth. If there is no gravity there is no weight, but there is still inertia. In ordinary speech the two concepts are often blurred, as in "a heavy object is harder to push". Nevertheless, weight is the pull of gravity and mass is inertia, and they are different concepts.
( Rodney A. Brooks )
[ Fields of Color: The theory ]
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