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In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. [1] It is that temperature and pressure at which the sublimation , fusion , and vaporisation curves meet.
In chemistry and physics, the triple point is the temperature and pressure at which solid, liquid, and vapor phases of a particular substance coexist in equilibrium. It is a specific case of thermodynamic phase equilibrium. The term "triple point" was coined by James Thomson in 1873.
Below the triple point, the substance can exist only as a solid or a gas, depending on the temperature and pressure. Above the triple point, the substance can exist only as a liquid or a gas. For example, the triple point of water is at a temperature of 0.01 degrees Celsius and a pressure of 611.657 pascals.
11 wrz 2022 · In chemistry and physics, the triple point of a pure substance is the combination of temperature and pressure where three phases exist in thermodynamic equilibrium. Usually, the triple point refers to the point where a substance’s solid, liquid, and vapor phase coexist in equilibrium.
The triple point of a substance is the specific temperature and pressure at which three phases (gas, liquid, and solid) coexist in thermodynamic equilibrium. This unique point is crucial in understanding phase equilibria and phase diagrams, as it provides a reference for the behavior of materials under varying conditions.
30 sty 2023 · Figure 1. General Phase diagram. Triple point – the point on a phase diagram at which the three states of matter: gas, liquid, and solid coexist. Critical point – the point on a phase diagram at which the substance is indistinguishable between liquid and gaseous states.
At the triple point, the three phases of a substance can exist simultaneously without any change in mass or energy, demonstrating thermodynamic equilibrium. The triple point is critical for defining temperature scales; for example, the Kelvin scale is defined using the triple point of water.
