Question

Can pressure be zero?

Answer 1

Absolute pressure is measured relative to absolute zero on the pressure scale, which is a perfect vacuum. (Absolute pressure can never be negative.) ... Gage pressure is thus zero when the pressure is the same as atmospheric pressure. (It is possible to have negative gage pressure.)

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Answer 2

Absolute pressure is measured relative to absolute zero on the pressure scale, which is a perfect vacuum. (Absolute pressure can never be negative.) ... Gage pressure is thus zero when the pressure is the same as atmospheric pressure. (It is possible to have negative gage pressure.)