Question No$.12$: $($a$)$ State the difference between extensive, intensive and specific properties of a thermodynamic system.

$($b$)$ Air at $20\backslash$deg C and $7$ bar is contained in a rigid tank of $0\mathrm{.}57$ m$3$ volume capacity. The tank is provided with a valve that opens at a pressure of $8\mathrm{.}5$ bar and remains open until the pressure drops to $8\mathrm{.}15$ bar.

Determine:

$($a$)$ Air temperature just before the valve opens

$($b$)$ Mass of air lost due to fire.

Assuming: A fire occurs and causes the valve to open and the temperature of the air remains constant during discharge and air in the tank behaves as an ideal gas