Noun
partial vacuum (plural partial vacuums)
A region of low atmospheric pressure, especially one in which most of the air has been pumped out.
A partial vacuum, or rough vacuum, can be created using a positive displacement pump that transports a gas load from an inlet port to an outlet (exhaust) port. Source: Internet
Larger models, which can store over 200 litres (53 US gallons), are often hooked up to compressed air, utilizing the Venturi effect to produce a partial vacuum. Source: Internet
Experiments are being performed on the Avogadro Project's silicon spheres to determine whether their masses are most stable when stored in a vacuum, a partial vacuum, or ambient pressure. Source: Internet
Further damage can result as the gases cool and pressure drops sharply, leading to a partial vacuum. Source: Internet
Industrial Revolution Boulton & Watt engine of 1788 The Watt steam engine was the first type of steam engine to make use of steam at a pressure just above atmospheric to drive the piston helped by a partial vacuum. Source: Internet
It was the first type of steam engine to make use of steam at a pressure just above atmospheric to drive the piston helped by a partial vacuum. Source: Internet