Question

The density of water is 1 g cm-3 and the density of iron is 7.8 g cm-3. The density of mercury is 13.6 g cm-3. Answer the following i) Will a piece of iron float or sink in water. ii) Will a piece of iron float or sink in mercury.​

Answer 1

Answer:

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Explanation:

Density of water 1.0 g\ cm^{-3}

(a) Density of piece of iron = 7.8\times10^3\ g\ cm^{-3}

= 7.8\times10^3\ g\ cm^{-3}

= \frac{7.8}{1000}

= 0.0078gcm³ < 1.0 g cm³

Therefore, density of piece of iron is less than density of water

Hence, piece of iron will float in water

(b) Density of piece of iron = \frac{7.8}{1000}

Density of mercury = 13.6\times10^{-3}\ g\ cm^{-3}

Since 7.8\times10^{-3}\ <\ 13.6\times10^{-3}

Therefore the density of pieces of iron is less than the density of mercury.