Question

Helium gas is escaping from a large reservoir through an attached nozzle. The inside temperature is 900 c and outside temperature is 400c. What is the velocity of gas at the exit of nozzle.

Answer 1

nonetheless.

The first linked article nicely summarizes why this has become a pressing concern in recent years.

In response to the element’s scarcity, the United States has been stockpiling helium since the 1960s in a National Helium Reserve called the Bush Dome, a deep underground reservoir outside of Amarillo, Texas. By the mid 1970s 1.2 billion cubic meters of the gas was stored there. The current reserve is approximately 0.6 billion cubic meters, or roughly 4 times the current world market.