They are quite different things. The relationship between the two is: weight = mass x gravity.
For more information about the difference between the two, check the Wikipedia article on "Mass versus weight".
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And what particular human are you referring to? Also, I am a bit rusty about this, are weight and mass the same thing?
No. The relationship is: weight = mass x gravity Mass causes both weight, and inertia. Weight is the force of attraction by gravity, and also depends on the gravitational field, not just on the mass. For more information, check the Wikipedia article "Mass versus weight".
Is weight and mass the same thing? Is 1 kg always 2.2 pounds? At the surface of the Earth, yes. On the moon, 1 kg would be about 0.7 pounds. Weight is the effect of gravity on mass. In space, you have no (or very little) weight, but you still have the same mass. Astronauts in the ISS have no weight and can float around, but if they want to move themselves, they have to deal with inertia.
Gram is neither a measure of length, nor of weight. It is a unit of mass. Sometimes this is confused with weight, but it isn't the same thing.
Density is defined as the mass of something divided by the volume of the same thing. During a careful reading of the definition, it becomes apparent that density is not mass, and that density is also similarly not weight as well, either.