winds
the answer is both
They can both be burned at high pressures
It isn't that simple. Pressures will be based on a number of factors, including ambient air temperature, elevation, and humidity. The pressures should read in accordance to the pressure/temperature chart for an R134a system.
Air moves from areas of high pressure to areas of low pressure (in order to equalise the pressure). When air moves, it is called wind.
If you are talking about the a/c pressures using gauges then depending on the outside temperatures the low side can be between 30 to 45psi and the high side can be between 200 to 250psi......
Air evaporates
Air moves from areas of high pressure to areas of low pressure (in order to equalise the pressure). When air moves, it is called wind.
The "high side" of a car a/c typically reaches 300+ psi.
You can expect to find high surface pressures at the poles because they have all of the cold air sinking down to the surface due to the low intensity of insolation on the poles.
The movement of pressure systems; highs and lows. When a low approaches, which is an area of rising air, pressures fall and when a high approaches, which is an area of sinking air, pressures rise.
High surface pressures are typically found at latitudes near 30 degrees north and south, known as the subtropics, where air descends and warms, creating areas of high pressure. This sinking air suppresses cloud formation and precipitation, leading to clear skies and generally stable weather conditions.
Diffusion due to differences in air pressures.