The air would be so thin that even the best climber would have no choice but to use supplemental oxygen. Why? Because of the many factors which affect atmospheric pressure. Pioneering scientists ...

If it’s higher, you may need to release some air to bring it down to the proper level. Attach the air pump to the valve stem.

You need a common tire pressure gauge, and a source of compressed air. There are many types of gauge, but they all essentially work the same way and fit a standardized tire valve stem. Compressed ...