Low pressure
I am not sure if they are proportional, but they are inversely related. High pressure makes a low vacuum, and low pressure makes a high vacuum.
a vacuum is simply an empty or almost empty space. The forces that are apparent with vacuums are due to a pressure imbalance between the inside of the vacuum (low pressure) and the outside of the vacuum (high pressure) causing particles to want to migrate to areas of lower pressure. The effect of this pressure difference is often refered to as a vacuum force
The ultimate objective of a manufactured vacuum is zero pressure.The better the vacuum, the closer the pressure is to zero.
The atmospheric pressure on the moon is nearly zero (effectively vacuum).
its can be a restriction in liquide line
A High Pressure area on a weather map is represented by a Blue "H". Usually around this high pressure area is pleasant weather, because high pressure areas don't allow for cloud formation.
Air.
Diffusion occurs when an area of high pressure meets an area of low pressure. They mix together and create an equilibrium, all particles spread out equally.
An internal combustion engine needs air and atomized fuel to run. In a naturally aspirated engine (one which does not use forced induction), the downward movement of the piston, on the intake stroke, causes an area of low pressure or vacuum in the cylinder. The fuel and air mixture moves from the relatively high pressure outside to this low pressure area and is then compressed for combustion. Without this vacuum effect of piston movement, an alternate source of pressure would be necessary to effect this fuel/air induction.
An eductor works by using high-speed fluid flow to create a low-pressure area, which causes suction or a vacuum effect in a fluid system. This low-pressure area draws in fluid or gas from the surrounding environment, allowing the eductor to effectively move and mix fluids within the system.
Winds are generated when air flows from a high pressure area into a low pressure area. This movement occurs due to the pressure difference, with air moving from areas of higher pressure to lower pressure to equalize the pressure gradient.
Air mass - refers to any area of high or low pressure. A front - is the point at which an area of high pressure meets an area of low pressure.