Britannica
Sources used in this answer
Why is vacuum coating performed in low-pressure chambers?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
vacuum technology
Diagram of a McLeod gauge.
Vacuum coating is performed in low-pressure chambers primarily to extend the distance a particle must travel before colliding with another molecule. By reducing the number of gas molecules present, the process ensures that particles can move from the source to the target without undergoing unwanted collisions.1
This environment is essential for achieving high-quality results in vacuum technology, as it allows for the precise deposition of materials onto a surface. Beyond facilitating particle travel, operating under vacuum conditions also helps minimize surface contamination by reducing the frequency of molecular impacts, ensuring the integrity of the coating process.1