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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Vacuum is just a term we use to describe an area that has relatively low pressure or near-zero pressure. Vacuums exist as a lack of pressure in exactly the same way that cold exists as a lack of heat—it’s not a thing unto itself, but it is a useful concept for discussion purposes. That’s probably what your teacher was trying to convey, but if so they did a poor job of communicating it.
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