Put them in a balance.
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Well, darling, the mass of a swimmer can vary greatly depending on the individual. On average, though, a swimmer might weigh around 70-90 kilograms. But hey, if you're looking to get specific, you might want to invest in a good ol' scale and find out for yourself!
Use a digital mass scale or a triple-beam-balance scale to find the mass of a regular solid.
Mass = Pressure*Area
Density = Mass / Volume Rearranging this gives: Volume = Mass / Density Mass = Density × Volume
You have to know two out of three ... mass, volume, density ... then you can find the missing one. If density is missing . . . Density = (mass)/(volume) If mass is missing . . . Mass = (density) x (volume) If volume is missing . . . Volume = (mass)/(density)