Critical point - the line showing the conditions of pressure and temperature under which the liquid and gas phases are in equilibrium terminates at this point; beyond which, the liquid and gas phases become i

Green chemistry - the utilization of a set of principles that reduce or eliminate the use or generation of hazardous substances in the design, manufacture and use of chemical products

Phase diagram - a diagram summarizing the conditions under which a substance exists as a solid, liquid or gas for a closed system

Phase-transfer catalyst - a substance that will increase the rate of reaction between reactants present in separate phases

Supercritical fluid - a substance above its critical point which shows the properties of both a liquid and a gas

Sustainable development - development meeting the needs of the present without compromising the ability of future generations to meet their needs

Triple point - the point on a phase diagram at which the three phases coexist at equilibrium