308800 Chapter Notes - Chapter 3: Phase Rule, Ideal Gas
11 Nov 2013
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Pure substance: has homogeneous and invariable chemical composition. Water is always a pure substance, whether it is in liquid, solid or vapour form. A mixture of gases is considered a pure substance as long as there is no change in phase. Compressible substances: surface effects, magnetic effects and electrical effects are insignificant when dealing with them. Critical point: substance at critical temperature, critical pressure and critical volume: critical pressure: the pressure at which, anything at a higher pressure will not become saturated, instead will change phase from liquid directly to vapour. Independent properties of a pure substance: a simple, compressible, pure substance can be defined by two independent properties. Tables of thermodynamic properties: steam tables: defines properties of a given state. The compresssibility factor: compressibility factor, for an ideal gas, z = 1. Equations of state: equation in terms of four parameters: a, b, c and d, when all four parameters are zero, equation simplifies to ideal gas model.
