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The density of water at $20^{o} C$ is $998 k g / m^{3}$ and at $40^{o} C$ is $992 k g / m^{3}$ . The coefficient of volume expansion of water is
$3 \times 10^{- 4} /^{o} C$
$2 \times 10^{- 4} /^{o} C$
$6 \times 10^{- 4} /^{o} C$
$10^{- 4} /^{o} C$

3 \times 10^{- 4} /^{o} C

6 \times 10^{- 4} /^{o} C

10^{- 4} /^{o} C

2 \times 10^{- 4} /^{o} C

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