What is the $k$ value of air?

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$k$ value of air:
The letter $k$ in relation to air can refer to the ratio of the specific heat capacity of air at constant pressure to the specific heat capacity of air at constant volume. For air, this value is roughly equal to $1.4$ .
$k$ can also be used to denote thermal conductivity, which for air has a value of $0.024 W \cdot m^{- 1} K^{- 1}$ approximately.

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