Aircraft and space vehicles, such as satellites and rockets, endure extreme conditions while in flight. These extreme conditions can cause failure in critical components, which can have catastrophic results. Testing parts for aircraft and space vehicles in an altitude chamber can help manufacturers develop durable parts that operate well during flight, despite the quickly-changing and extreme conditions caused by high altitudes. Altitude testing measures a number of factors aircraft and space vehicle components are likely to experience at extreme heights. Environmental Extremes at High Altitudes Life close to the surface of the planet is quite comfortable, with generally survivable temperatures