The Galapagos Triple Junction is a geological area in the eastern Pacific Ocean several hundred miles west of the Galapagos Islands where three tectonic plates - the Cocos Plate, the Nazca Plate and t
he Pacific Plate - meet. [Wikipedia]
(1) The thermodynamic state at which three phases of a substance exist in equilibrium. (2) A junction point of three distinct air masses within the tropics at which cyclogenesis may occur. syn. triple
state
The temperature, 273.16 K by definition, and pressure, 611.657 Pa, at which ice, water and water vapour are in thermodynamic equilibrium. The term 'point' derives from the practice in thermodynamics o
f choosing temperature and pressure as the coordinates of a two- or higher-dimensional phase diagram.