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.
So, once we have all the critical points in hand all we will need to do is test these points to see if they are relative extrema or not. To determine if a critical point is a relative extrema (and in fact to determine if it is a minimum or a maximum) we can use the following fact. Fact. Suppose that is a critical point of and that the second order partial derivatives are continuous in some region that contains.