What does a vacuum gauge indicate?

A vacuum gauge indicates the amount of vacuum present below atmospheric pressure. This type of gauge measures how much lower the pressure is within a system compared to the atmospheric pressure outside it. When the pressure drops inside a vessel or pipe, it creates a vacuum, and this is what the vacuum gauge is designed to quantify.

Vacuum gauges are commonly used in various engineering applications to ensure that systems operate within safe and efficient pressure ranges. For example, in vacuum systems, maintaining the correct level of vacuum is crucial for effective operation, and the vacuum gauge provides valuable information to operators about the current state of the system.