VACUUM PUMP, DIFFUSION. A DEVICE USED TO EXHAUST AIR OR OTHER GASES
FROM A CLOSED VESSEL OR SYSTEM, CREATINGEXTREMELY LOW PRESSURES BY
MEANS OF HEATING A PUMPING FLUID THROUGH ONE OR MORE STAGES AND PASSING
THE HOT VAPORS THROUGH ONE OR MORE JETS. IT MAY BE USED IN CONJUNCTION
WITH A MECHANICAL VACUUM PUMP TO PRODUCE A VERY HIGH VACUUM.
