háromfázisegyensúlyi

háromfázisegyensúlyi, meaning three-phase equilibrium in Hungarian, refers to a state in thermodynamics where a system exists in equilibrium among three distinct phases. This typically occurs at a specific temperature and pressure known as the triple point. At this unique point, all three phases of a substance – solid, liquid, and gas – can coexist in stable equilibrium. Changes in temperature or pressure from the triple point will cause one or more of the phases to disappear, shifting the system towards a two-phase or single-phase equilibrium. The concept is fundamental to understanding phase diagrams and the behavior of matter under varying conditions. For example, water has a triple point at 0.01 degrees Celsius and 611.657 pascals, where ice, liquid water, and water vapor are all present simultaneously. The existence and precise location of a triple point are characteristic properties of a pure substance and are crucial for applications such as calibration of thermometers and understanding atmospheric phenomena.