My high school chemistry teacher said that there is no such thing as a “vacuum,” it’s just a difference in air pressure. But you always hear about the “vacuum” of space, or when something is “vacuum-sealed.” I am not scientifically inclined, so I don’t even know where to begin. Im also not sure if “physics” is the correct flair lol. I was wondering if it could be explained from either side of the argument.
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A vacuum is when there’s less particles than normal. A perfect vacuum would be no particles at all.
This means a few things, for instance with pressure, we are used to the atmospheric pressure, and when there’s less pressure than that, we call it a vacuum.
For something to be vacuum sealed it means that the air inside it was removed and it was sealed so new air can’t come in.
In space there’s very very few particles and therefore pressure, so we call it a vacuum.
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