Very low pressure can cause which phenomenon that alters the physical and chemical properties of materials?

Outgassing is a phenomenon that occurs when materials release gas that was previously absorbed, trapped, or dissolved within them. Under very low pressure, the boiling point of substances decreases, leading to the transition of material from a solid or liquid state to a gaseous state even at lower temperatures. This is particularly relevant when considering materials used in avionics and aerospace applications, where reduced pressure conditions can be encountered.

In the context of avionics, materials may undergo outgassing in a vacuum or low-pressure environment, which can lead to contamination or degradation of other materials and components nearby. This is crucial for maintaining the integrity and reliability of sensitive electronic systems, as outgassing can affect performance and operational safety.

Understanding this process helps engineers and technicians take appropriate measures to mitigate the risks associated with outgassing, such as selecting materials with low outgassing properties or implementing proper sealing and containment strategies.