During shipment, equipment is subjected to pressure changes which can lead to what?

The correct answer highlights the phenomenon of "breathing," which refers to the changes in air and moisture content within the packaging of equipment when it is subjected to varying pressure conditions during shipment. As the pressure changes, it can cause the packaging materials and any protective barriers to expand or contract. This process can trap or release moisture and air inside, potentially leading to condensation and moisture accumulation. Such conditions can create an environment conducive to corrosion, particularly for sensitive electronic components within the equipment.

Choosing "breathing" recognizes the interplay between environmental factors and packaging integrity, which is crucial for the preservation of avionics and other sensitive devices. Understanding how equipment behaves during transportation is vital for preventing damage from moisture, which can adversely affect functionality and longevity.