The density of water at $20^oC$ is $0.998\, gm/cm^3$ and at $40^oC$ is $0.992\, gm/cm^3$. The mean coefficient of cubical expansion (in per $^oC$) is :-

  • A

    $1 \times 10^{-4}$

  • B

    $2 \times 10^{-4}$

  • C

    $3 \times 10^{-4}$

  • D

    $6 \times 10^{-4}$

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