Using the phase diagram for CO2, what phase is carbon dioxide in at -20°C and 1 atm pressure?
A. It is in the gas phase.
B. It is in the solid phase.
C. It is at its boiling point.
D. It is in the liquid phase.

If you fill your car tire to a pressure of 32 psi (pounds per square inch) on a hot summer day when the temperature is 35°c (95°f), what is the pressure (in psi) on a cold winter day when the temperature is -15°c (5°f)? assume no gas leaks out between measurements and the volume of the tire does not change.