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Thermal Physics

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6 Jan 2008 19:00:20 IST

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INTERESTING QUESTION ON THERMODYNAMICS

None

BOYLE'S LAW ->
PV=CONSTANT --- (1)

CHARLE'S LAW->
V PROPORTIONAL TO T ----(2)

CHARLE'S LAW OF PESSURE->
P PROPORTIONAL TO T ---(3)

COMBINING (2) AND (3)
P/V=A CONSTANT

SO WHY
PV = CONSTANT

AND WHY NOT P/V = CONSTANT.

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Comments (6)

NITESH BASKARAN

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6 Jan 2008 19:28:03 IST

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you dont conclude from 2 and 3 that
PV=constant or P/V is constant
its an experimental observation

svj 29

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Posts: 822

6 Jan 2008 20:23:57 IST

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ur question is wrong dear frnd.......
BOYLE'S LAW ->
PV=CONSTANT ---
"AT CONSTANT TEMPERATURE"

CHARLE'S LAW->
V PROPORTIONAL TO T ----
"AT CONSTANT PRESSURE"

CHARLE'S LAW OF PESSURE->
P PROPORTIONAL TO T ---
"AT CONSTANT VOLUME"

so u can never get anydng out of dese eqns.........as d cnditions are totally different......

Bipin Dubey

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Joined: 23 Jan 2007

Posts: 7942

6 Jan 2008 20:31:56 IST

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Equation 2 is applicable when pressure is constant.

Equation 3 is applicable when volume is constant.

The conditions are different.

Pankti Kansara

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6 Jan 2008 20:35:55 IST

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hey i agree wid svj29.........in no wez u can compare d eqns as they r in diff condns
so u can never add or sub or do ne such operations wid them

VIV PAR

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6 Jan 2008 21:04:52 IST

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thanks

bladeX -rise of a new sun

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Posts: 1249

7 Jan 2008 14:02:42 IST

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it's totally absurd the way you concluded it
actually P

T when V is constant
V

T when P is const
P/V =const only under different restriction that condition is V ^2

T
but PV= const when temp. is const.
you must have thought that on inc. t the p increases as well as v so p/v should be const
but don't forget the adiabatic compr. on compressing the gas t increases although V is decreasing and P is increasing

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