hármaspontként

The Hungarian term "hármaspontként" translates to "as a triple point" in English. It is a specific state of a substance where all three phases – solid, liquid, and gas – coexist in thermodynamic equilibrium. This unique condition occurs at a precise temperature and pressure, unique to each substance. For water, for instance, the triple point is at 0.01 degrees Celsius (273.16 Kelvin) and a pressure of 611.657 Pascals. These conditions are so specific that they are used as a fundamental fixed point for calibrating thermometers. The existence of a triple point is a direct consequence of the phase diagram of a substance, which graphically represents the conditions under which different phases exist. The intersection of the sublimation curve (solid-gas), vaporization curve (liquid-gas), and melting curve (solid-liquid) defines the triple point. Above the triple point pressure, a substance can transition directly from solid to gas (sublimation) or gas to solid (deposition), bypassing the liquid phase. Below the triple point pressure, a substance cannot exist as a liquid; it will either be solid or gas. Understanding the triple point is crucial in fields like chemistry, physics, and materials science for precise measurements and for comprehending the behavior of matter under varying conditions.