Ahelium weather balloon is filled to a volume of 219 m3 on the ground, where the pressure is 754 torr and the temperature is 298 k. as the balloon rises, the pressure and temperature decrease, so it is important to know how much the gas will expand to ensure that the balloon can uphold the expansion. what is the volume at an altitude of 10,000 m, where the atmospheric pressure is 210. torr and the temperature is 230 k?