You can literally SEE a shockwave from an explosion... That is gas under pressure.

Please think about it for a min and answer the question: What actually causes gas to pressurize?

Why does pressurized gas in a container stay pressurized? What specifically is the container doing to keep the gas pressurized?

You can literally SEE a shockwave from an explosion... That is gas under pressure.

Please think about it for a min and answer the question: What actually causes gas to pressurize?? Hint: It's not a container.