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Q.

The density of water at 20°C is 998 kg/m³ and that at 40°C is 992 kg/m³. The coefficient of cubical expansion of water is

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a

0.6 x 10^-4/°C

b

0.4 x 10^-4/°C

c

none of these

d

0.2 x 10^-4/°C

answer is D.

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Detailed Solution

$ρ_{0} = ρ (1 + γt) ∴ 998 = 992 (1 + γ \times 20) γ = \frac{6}{20 \times 992} = \frac{6 \times 10^{- 4}}{1 .9840} /^{\circ} C$

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