vacuum

Vacuum Doesn’t Always Mean “No Air”

What does vacuum mean?

It’s easy to think that vacuum means “no air,” but it’s actually a bit wrong.

For example, typical vacuum-packed foods contain a great deal of air.

However, the expression “vacuum packing” is not wrong.

Vacuum means “a space filled with gas at a lower atmospheric pressure than usual”.

You don’t have to completely evacuate the air to create a vacuum.

In other words, any place where the air is thinner than the space we usually live in maybe called a vacuum.

Vacuum is divided into three stages, high vacuum, medium vacuum, and low vacuum, in order from the one with the strongest atmospheric pressure.

・References
https://tama.wtf/jp/science/physical-chemistry/vacuum
ScienceDirect Topics: Vacuum Packaging

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