negative pressure
Noun
Meaning
Pressure that is less than normal atmospheric pressure
The tension in a liquid that is thermodynamically metastable with respect to the vapour phase; especially that in the xylem of vascular plants that allows transpiration to great heights
Source: en.wiktionary.orgSynonyms
Examples
What it takes to produce a gravitational repulsion is a negative pressure. According to general relativity, it turns out... both pressures and energy densities can produce gravitational fields, unlike Newtonian physics, where it's only mass densities that produce gravitational fields.
Music has become a bigger business, and with that there is more pressure to succeed; I think that it creates a negative pressure for being creative.