"A vacuum is a region of reduced pressure with respect to atmosphere as a baseline, i.e. the removal of particles." "PV = nRT to some approximation, so you can reduce pressure by reducing the number of particles (n) or the temperature (T), or by increasing the volume (V)." ~Clearly. How vulgar of me.
During a recent, gaseous, conversation with a partner, I defined a vacuum to be "the elimination of space between particles." I drew the following picture. o o o o o o o o ==> o o o o o o o o I claimed that the group of particles to the right were experiencing a vacuum. Not a total vacuum, it seems apparent now. Is it an oxymoron to describe such a thing as a partial vacuum, or would this simply be a case of negative pressure? In the group