A Newton. Not a kilogram, which is a measure of mass, not weight. And cetainly not pounds or stones which are not only measures of mass but are used by few countries.
The force that gravity exerts on a given mass. Gravity = 9.8 m/s^2 F = M*A Weight = Mass * Gravity That is why your WEIGHT is different on the moon, but your mass will always be the same. Mass is a...