Thermo Notes6

8/15/2019 Thermo Notes6

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CHAP. 4]

PROPERTIES OF PURE SUBSTANCES

p

/

/

T

Solid region

v

/

S-G

Fig. 4-1

s

Liquid

region

I

I

I

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, Fluid region

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•

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/

CHAPTER

3.

Vo lume tr ic

PVDiagram

Figure 3.1 does not provide any information about volume; it merely

aries on a PT diagram. On a P V diagram [Fig. 3.2(a)] these bounda

where two phases- solidlliquid, solid/vapor, and liquid/vapor- co

regions are separated by bounding curves that represent single phas

which determine the molar (or specific) volumes at intermediate

Fig. 3.1 here becomes a horizontal line, where the three phases coe

and pressure.

Fluid

Solid/liquid

~ T,

I

I

I

:2 \ C

: : : J ,

a ------------------ P

~ .... c

',Gas

.. .

. . .

,

. . . . . .

Vapor ...~

To

p

p

Solid/Vapor

v

a

(b

Figure 3_2:P V diagrams for a

pure

substance. (a) Showingsolid, liquid, a

liquid, liquid/vapor,and vaporregions

with

isotherms.

Figure 3.2(b) shows the liquid, liquid/vapor, and vapor region

four isotherms superimposed. Isotherms on Fig. 3.1 are vertical

greater than

Tc

do not cross a phase boundary. On Fig.

3.2(b)

the i

therefore smooth.

The lines labeled

T l

and

T2

are for subcritical temperatures,

ments. The horizontal segment of each isotherm represents all poss

vapor in equilibrium, ranging from 100% liquid at the left end to 10

The locus of these end points is the dome-shaped curve labeled BC

(from

B

to C) represents single-phase liquids at their vaporization (


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