What is the temperature at which a substance may exist in all three phases?

The temperature at which a substance can exist in all three phases (solid, liquid, and gas) is called the triple point .

Εδώ είναι γιατί:

* Triple Point: It's the specific temperature and pressure at which the solid, liquid, and gaseous phases of a substance are in equilibrium. This means that all three phases can coexist at the same time.

* Ισορροπία: At the triple point, the rates of transitions between the phases are equal. For example, the rate of melting (solid to liquid) is equal to the rate of freezing (liquid to solid).

Παράδειγμα:

* The triple point of water is 0.01°C (273.16 K) and 611.73 pascals (4.58 mm Hg). This means that at this specific temperature and pressure, water can exist as ice, liquid water, and water vapor simultaneously.

It's important to note that the triple point is unique for each substance and is not the same as the melting point or boiling point.