2. What is the correct definition of “triple point” ?
(A) The temperature and pressure at which solid, liquid, and gas simultaneously exist.
(B) The most common experimental conditions of 1 atm, 298 K, and 1 mole of material.
(C) The reaction conditions of material at which the oxidated state and reduced state areequally likely to occur.
(D) The series of cyclical conditions at which a material can change from solid to liquid,liquid to gas, or gas to liquid.