Guys I said weight - so yes that implies a gravitational field - why not simply assume the same place on the surface of the Earth and thereby hold it constant and use an exotic device like say scales?
Also density or air pressure doesn't come into it if you shove a 100 pounds of gold onto large enough scales - then measure it, shove 100 pounds of feathers onto said scale etc. See which is heavier?
I can see alot of dodging - but no one prepared to say I think ... and chance being right or wrong...
Take a chance and rather than comment on my knowledge display your own. See if you're right, call it a challenge