Compressed air is stored in a pressure bottle with a volume of 100 L, at 500 kPa absolute and 20∘C. At a certain instant, a valve is opened and mass flows from the bottle at m˙ = 0.01 kg/s. Find the rate of change of temperature in the bottle at this instant.

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.

If the pressure in a gas is doubled while its volume is held constant. true or false

Why is a noble gas different from other elements?