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Originally Posted by sanddrag
negative pressure? Is there such thing?  I thought zero pressure like the true vacuum of space is the least pressure you can have. |
It's like energy: it depends on your reference. I could have 0 potential energy with respect to the ground. But, if someone digs a hole next to me, I have some potential energy with respect to the bottom of the hole.
Negative pressure usually refers to negative with respect to atmospheric.