7. Nitrogen in laboratory settings can be supplied from liquid nitrogen tanks. These tanks contain mostly liquid N₂ by mass, but one of the ports on the tank is connected to

the "headspace", i.e. the region above the liquid. When the port to the headspace is opened, cold nitrogen vapor flows out of the tank. a. If the tank is well-insulated, how will the pressure and temperature inside the tank change as the nitrogen is used up? (It would commonly take days or weeks to use all the nitrogen.) Explain. b. How will they change if the tank is very poorly insulated? Explain.