Water at the Triple Point - Video














Water at the Triple Point

Water at the Triple Point

The triple point of a substance is the temperature and pressure at which three phases (liquid, gas, and solid) of that substance may coexist in thermodynamic equilibrium.

For example, at high temperatures and increasing pressure, water results in first liquid, and then solid (above 109 Pa - a crystalline form of ice which is denser than water begins to form). At lower temperatures the liquid state ceases to appear with compression causing the state to pass directly from gas to solid.