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Look up the density of steel. It should be no different in a spaceship than on Earth.
Calculators are no different than computers. The tiny chip use binary to come up with the anwer.
If they are all numbers - no letters other than e or pi, then they are arithmetic. Otherwise they are probably algebraic. But beware, phi is also arithmetic.
Mass is the amount of substance an object can have
Individual atoms may be heavier or lighter. Also, the spacing between atoms may vary.