Nullrõhk

Nullrõhk refers to a state where the pressure within a system is lower than the ambient atmospheric pressure. This concept is often encountered in engineering and physics. For instance, in vacuum systems, the goal is to achieve and maintain a nullrõhk to facilitate specific processes. This low-pressure environment can prevent unwanted chemical reactions, allow for the outgassing of materials, or be essential for the operation of certain scientific instruments.

Achieving nullrõhk typically involves the use of pumps that remove gas molecules from a contained space. The degree of nullrõhk, often measured in Pascals or Torr, indicates how close the system is to a perfect vacuum. Even a slight reduction in pressure can have significant effects. In industrial applications, nullrõhk can be used for processes like vacuum drying, where the reduced pressure lowers the boiling point of water, allowing it to evaporate at lower temperatures and preserving heat-sensitive materials. In some manufacturing processes, like semiconductor fabrication, precise control of nullrõhk is critical for achieving high-quality results. The absence of air can prevent contamination and ensure the integrity of delicate structures.