What is pressure in space?

Pressure in space, or the vacuum of space, is extremely low compared to Earth's atmosphere. It is defined as the force exerted by particles in a given area, but in space, the density of particles is so low that the pressure is nearly negligible, often measured in micro-pascals. This lack of pressure affects everything from the behavior of gases to the physical state of materials, leading to phenomena such as the boiling of liquids at lower temperatures. In essence, space is characterized by a near-complete absence of air and atmospheric pressure.