Liquid butane (C4H10) is stored in cylinders to be used as a fuel. The normal boiling point of butane is listed as -0.5 °C. (b) Suppose the valve to the tank is opened and a few liters of butane are allowed to escape rapidly. What do you expect would happen to the temperature of the remaining liquid butane in the tank? Explain.

Video transcript

Hi everyone. So you have a local propane which is C three H eight and it's stored in a gas tank. I asked which of the following will cause a decrease in the temperature of the tank in order to store propane as a liquid. The pressure in the tank needs to be greater than atmospheric pressure. The pressure should behind such that in the phase diagram of propane the conditions are above the gas. Look at line when some liquid escapes the tank, some of the remaining liquid in the tank will evaporate to maintain the equilibrium vapor pressure. We're gonna have C3H8 left win. Want to see three age eight. Yes. And this is an endo thermic process. Butane absorbs heat from the surroundings. So this is gonna lead to a decrease and the temperature of the tank and butane liquid and also adding more gas to the tank. It's gonna lead to an increase of the pressure. It's also gonna cause the temperature to increase as well. This is gonna be b releases some propane gas from the tank. It's gonna cause a decrease in the temperature of the tank. Thanks for watching my video and I hope it was up for