How Does It Work
During an altitude test, the product is installed within a chamber capable of withstanding the differential pressure. Air from inside the chamber is gradually removed at a controlled flow rate, until the required low pressure to simulate the high altitude level is achieved. The low pressure environment is maintained for the duration of the test to evaluate the physical and/ or operational effect of the environment on the product.
Controlled Vacuum Collapse
This video is an example of how important it is to use the proper equipment and what could happen if the system used is not designed to handle such high negative pressure.
Galileo’s Gravity Theory
In this video, Galileo gravity theory is demonstrated 400 years later in NASA’s huge vacuum chamber. This is not necessarily how Altitude testing works, per se, however, it is an example of a zero gravity experiment, when the masses of the objects don’t have any effect on the free-falling speed anymore, cancelling the air resistance by removing the air from the chamber (and creating vacuum).