Archimedes’ principle can be used to calculate the density of a fluid as well as that of a solid. Suppose a chunk of iron with a mass of 390 g in air is found to have an apparent mass of 340 g when completely submerged in an unknown liquid.
What mass of fluid, in grams, does the iron displace?

Question

Archimedes’ principle can be used to calculate the density of a fluid as well as that of a solid. Suppose a chunk of iron with a mass of 390 g in air is found to have an apparent mass of 340 g when completely submerged in an unknown liquid.
What mass of fluid, in grams, does the iron displace?

mrnood · Answer

This question is very badly phrased for a physics question - it has confused mass and weight - a cardinal sin in my view. The apparent change is in the WEIGHT of the iron

Archimedes principle states that the apparent loss in weight is equal to the weight of the fluid displaced.

The mass of that fluid is got by w=mg

mrnood · Answer

Archimedes' principle indicates that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces