PRESSURE

Note that if a diver’s pressure gauge were placed in a container and the container were partially evacuated, the gauge pressure would read negative even though the absolute pressure is still positive. e.g. A gauge pressure of -0.3 atm means that absolute pressure remaining is +0.7 atm. i.e., pabs (0.7 atm) = pgauge (-0.3 atm) + patm (1 atm) ................
................