Question

Calculate the adiabatic elasticities of air at N.T.P. ($\gamma$ = 1.4 for air)

• A. $1.013\times {10}^{5}N{m}^{-2}$
• B. $1.4182\times {10}^{5}N{m}^{-2}$
• C. $2.3\times {10}^{5}N{m}^{-2}$
• D. $4.1\times {10}^{5}N{m}^{-2}$

Answer 1

The correct option is B $1.4182\times {10}^{5}N{m}^{-2}$

Adiabatic elasticity,

$K=\gamma P$

Here, $\gamma =1.4$

$P=1.013\times {10}^{5}N/m^2$

$\therefore K=1.4\times 1.013\times {10}^{5}N/m^2$

$=1.4182\times {10}^{5}N/m^2$