2 covering for the human body most of the celebrants of the town's bicentennial will be in festive rigâso don't show up in jeans Synonyms apparel, attire, clobber [British slang], clothes, costumery, dress, duds, garments, gear, habiliment(s), habit [archaic], rags, raiment, clothing, rigging, threads, toggery, togs, vestiary, vestments, vesture, ...
It is therefore called the triple point of the substance, and it represents the only point in the phase diagram in which all three states are in equilibrium. Point C is the critical point of the substance, which is the highest temperature and pressure at which a gas and a liquid can coexist at equilibrium. The figure below shows what happens when we draw a horizontal line across a phase diagram at a pressure of exactly 1 atm.
1 The major features of a phase diagram are phase boundaries and the triple point. 2  Phase diagrams demonstrate the effects of changes in pressure and temperature on the state of matter.  At phase boundaries, two phases of matter coexist (which two depends on the phase transition taking place).