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.
The ultimate objective of a manufactured vacuum is zero pressure.The better the vacuum, the closer the pressure is to zero.
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
Air rises in a low pressure area and sinks in a high pressure area.
A high pressure area is usually an area that is being cooled, making the air move toward the ground. It gradually moves away from the high pressure area toward a low pressure area.
High pressure areas
The atmospheric pressure on the moon is nearly zero (effectively vacuum).
A fluid will move from high pressure to low pressure.
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.