The volume of 50 g of a substance
Question.
The volume of $50 \mathrm{~g}$ of a substance is $20 \mathrm{~cm}^{3}$. If the density of water is $1 \mathrm{~g} \mathrm{~cm}^{-3}$, will the substance float or sink in water ?

Solution:

Given, mass of substance, $m=50$ g;

volume, $\mathrm{V}=20 \mathrm{~cm}^{3} ;$ density, $\rho=?$

Density $=\frac{\text { Mass }}{\text { Volume }}=\frac{50}{20}=2.5 \mathrm{~g} \mathrm{~cm}^{-3}$

The density of the substance is more than the density of water $\left(1 \mathrm{~g} \mathrm{~cm}^{-3}\right) .$ Hence, the substance will sink in water.
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