PHASE DIAGRAMS A phase diagram tells us at a given temperature and pressure what is the most stable phase of a substance. 11 PDF文件使用"pdfFactory Pro”试用版本创建fmm,fineprint.com,cn
11 PHASE DIAGRAMS A phase diagram tells us at a given temperature and pressure what is the most stable phase of a substance. PDF 文件使用 "pdfFactory Pro" 试用版本创建 fwww.fineprint.com.cn
One-component systems 3 phases solid,liquid,gas Water vaD 3 two-phase equilibria HO(g) liquid-gas solid-liquid solid-gas I three-phase equilibrium all three phases co-exist:triple point 12 PDF文件使用"pdfFactory Pro”试用版本创建替ifineprint..com,c四
12 3 phases solid, liquid, gas 3 two-phase equilibria liquid-gas solid-liquid solid-gas 1 three-phase equilibrium all three phases co-exist: triple point One-component systems PDF 文件使用 "pdfFactory Pro" 试用版本创建 ÿ替Ì www.fineprint.com.cn
Construction of a Phase Diagram For one-component systems: Plot vapour pressure between solid gas (i.e.,unique pressure where both phases exist at given T-co-existence curve of solid gas): solid gas Temperature 13 PDF文件使用"pdfFactory Pro”试用版本创建w,fineprint,com,cn
13 Construction of a Phase Diagram For one-component systems: • Plot vapour pressure between solid & gas (i.e., unique pressure where both phases exist at given T – co-existence curve of solid & gas): solid gas Temperature P r e s s u r e PDF 文件使用 "pdfFactory Pro" 试用版本创建 ÿwww.fineprint.com.cn Ì
Construction of a Phase Diagram Plot vapour pressure of liquid as function of T(co- existence curve of liquid and gas): 900 800 760 .34.5 78.59100.0 700 Diethyl vapour pressure external pressure ether 600 500 400 300 Ethanol gas 200 Water 100 07 Temperature 20406080100 ATemperature(C) PDF文件使用"pdfFactory Pro”试用版本创建m,fineprint.com,cn
14 • Plot vapour pressure of liquid as function of T (coexistence curve of liquid and gas): liquid gas Temperature P r e s s u r e vapour pressure = external pressure Construction of a Phase Diagram PDF 文件使用 "pdfFactory Pro" 试用版本创建 Ìwww.fineprint.com.cn
Construction of a Phase Diagram Plot melting point of solid as function of pressure (co-existence curve of liquid solid): solid liguid Temperature Putting these all together gives phases at different P,T Phase diagram is unique to the given substance more complex for >1 component 15 PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint,con,cn
15 • Plot melting point of solid as function of pressure (co-existence curve of liquid & solid): liquid solid Temperature P r e s s u r e – Putting these all together gives phases at different P, T – Phase diagram is unique to the given substance – more complex for >1 component Construction of a Phase Diagram PDF 文件使用 "pdfFactory Pro" 试用版本创建 Ìwww.fineprint.com.cn