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MHT-CET : Physics Entrance Exam

MHT - CET : Physics - Thermodynamics Formulae Page 1

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 1. Equation of state for a perfect gas

 

PV = nRT
P, V, T
- Pressure, volume and temperature of the gas
R
- Universal gas constant
n
- Number of moles of the gas.

 

 

 

 2. Work done in an isothermal process

 

W =

2.303 nRT log10

[

V2

V1

]

=

2.303 nRT log10

[

P1

P2

]

 

 

 

 3. Equation of state for a real gas (one mole gas)

 

(

P +

a

V2

)

(V - b) = RT

a, b are Van der Waals constant

 

 

 

 4. Ist law of thermodynamics

 

dQ = dU + dW

dQ - Heat energy supplied

dU - change in internal energy

dW - Work done.

 

 

 

 5. External work done

 

dW =

P dV    joule

=

P dV

J

  cal or Kcal            J - Joule's mechanical equivalent of heat.

 

 

 

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