A weather balloon contains 59.5 L helum at sea level, where the atmospheric pressurels 101.3 kPa. Meteorologists want the balloon to eat at an altitude of
35,000 m where the pressure is 0.575 kPa. What volume will the balloon have at that altitude?

let that person have a turn to speak : )

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.