Is the final volume the same, larger, or smaller than the initial volume, if pressure and amount of gas do not change
a. a volume 505 mL of air on a cold winter day at -15 degrees celcius is breathed into the lungs, where body temperature is 37 degrees celcius
b. the heater used to heat the air in a hot-air balloon is turned off
c. a balloon filled with helium at the amusement park is left in a car on a hot day