Question

A pressure cooker contains air at 1 atm and ${30}^{\circ }$C. If the safety value of the cooler blows when the inside pressure $\ge$ 3 atm, then the maximum temperature of the air, inside the cooker can be

• A. ${90}^{\circ }$C
• B. ${636}^{\circ }$C
• C. ${909}^{\circ }$C
• D. ${363}^{\circ }$C

Answer 1

The correct option is B ${636}^{\circ }$C

Since volume is constant,
Hence $\frac{P_1}{P_2}=\frac{T_1}{T_2}\Rightarrow \frac{1}{3}=\frac{(273+30)}{T_2}$
$\Rightarrow$ $T_2$ = 909 K = ${636}^{\circ }$C