Nullrõhu

Nullrõhu, often translated as vacuum pressure or negative pressure, refers to a condition where the pressure within a confined space is lower than the surrounding atmospheric pressure. This pressure differential creates a force that pushes from the higher pressure area towards the lower pressure area.

In practical applications, nullrõhu is utilized in various technologies. For instance, it plays a crucial role in vacuum cleaners, where a fan creates a low-pressure zone, drawing in dust and debris. Similarly, in many industrial processes, vacuum pumps are used to generate nullrõhu for tasks such as material handling, degassing, and drying. In the medical field, vacuum-assisted closure therapy employs a controlled nullrõhu to promote wound healing.

The concept is also relevant in physics, particularly in understanding fluid dynamics and atmospheric phenomena. While a perfect vacuum, where pressure is absolutely zero, is difficult to achieve, the term nullrõhu encompasses a range of pressures below atmospheric. The magnitude of this pressure difference is measured in units like Pascals (Pa), millimeters of mercury (mmHg), or pounds per square inch (psi). Understanding and controlling nullrõhu is essential for the efficient and safe operation of many systems and devices.