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7. PROPERTIES OF Puresubstance

MODULE- III

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PureSubstance

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Phases o" a pure substance

Solid: Strongest intermolecular bonds

#i$uid: !ess strong intermolecular bonds compared to solid

%as: "ea#est intermolecular bonds compared to li$uid andsolid

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P&ASE'(&A)%E PRO(ESSESOF P*RE S*+STA)(ES :(ompressed #i$uid and Saturated #i$uid

Saturated apor and Superheated apor

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T'- diaram:

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P'- /iaram:

%onsider a piston&c'linder device that contains li$uid water at

MPa and ())

%.*he water is allowed to exchange heat with the surroundings so itstemperature remains constant.

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(riticalpoint:

*he point at which the saturated li$uid and saturated vapour

states are identical is called as critical point.

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P'T /iaram:*he diagram is also called phase diagram since all threephases are separated

from each other b' three lines.*he sublimation line separates the solid and vapour regions,the vapouri+ation line separates the li$uid and vapour regions, and the meltingline separates

li$uid and solid regions.

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P'-'T sur"ace:

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Property tables:

. Saturated li$uid&vapour

mixture ualit' is de-ned as the ratio of mass of water vapour tomass of the mixture.

mv

xmtotal

=

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2. Superheated vapour

. %ompressed li$uid

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STEA0 TA+#E

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DEPARTMENT OFMECHANICAL ENGINEERING

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(h-s) MOLLIER DIAGRAM FOR WATER AND STEAM

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Problems:

1.2

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1.3

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Quiz Test

Q.1 What is the difference between saturated liquid andcompressed liquid

Q.! What is the difference between saturated vapourand saturated vapour

Q." What is the difference between critical point andthe triple point

Q.# $oes hf%chan%e with pressure &ow

Q.' $efine quality and show it on ()v dia%ram.

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Thank You

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