This is usually done by weighing. On Earth, mass and weight are proportional; in fact, balances are usually calibrated for mass units, even if some of them really determine the weight.
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He discovered that you have to find the volume, mass, and density of something
The mass of an object can be expressed in mass per unit or in total mass. Total mass represent the full amount.
% of volume = 100*(volume of substance that you are interested in)/(total volume) % of mass = 100*(mass of substance that you are interested in)/(total mass).
Use a digital mass scale or a triple-beam-balance scale to find the mass of a regular solid.
it is the ratio of mass of saturated vapour to the total mass of liquid