About vacuum in production

Why we are not writing (-mmhg )in bpr(batch production record) for vacuum ?when vacuum guage and pressure transmitter showing us minus reading .

As because Vacuum is always considered as negative pressure.

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You are right sir but GDP telling us write which is you seen where gauge showing us minus reading so that.

Vacuums are used in various stages of manufacturing to improve product quality, increase productivity, and ensure safety . Below are just some of the diverse roles that vacuums play in modern manufacturing processes.