The characteristic equation of gases PV = mRT holds good for
Pv= mRT is known as ideal gas equation.
A gas which obeys kinetic theory perfectly is known as
Variation of pressure and volume at constant temperature are correlated through
As per Boyle’s law
At constant temperature
PV = Constant
Polytropic index n is given by
The work given out during expansion process in a closed system will increase when the value of n (the index of expansion)
For n = ∞ ⇒ w = 0
⇒ (isochoric process)
for n = 0
⇒ w = max
⇒ (isobaric process)
Hence with increase in index of expansion work decreases.
The work required for compression in a closed system increases the value of n (the index of compression)
In thermodynamics analysis, a pure substance is that which
Which one of the following PV - T diagram correctly represents that of an ideal gas?
If and for a thermodynamic system of an ideal gas on evaluation give the same quantify during a process, then the process under gone by the system is
For isothermal process,
PV = Constant
PdV + VdP = 0
∵ PdV = - VdP
A vessel of volume 1m3 contains oxygen (molecular weight = 32) at P = 1 bar and T = 47°C. The mass of oxygen in the vessel is (take universal gas constant as 8314 J/mol-K)
Nitrogen at an initial state of 10 bar, 1 m3, and 300 K is expanded isothermally to a final volume of 2m3. The p-v-T relation is , where a > 0. The final pressure.
For isothermal process
Hence final pressure will be slightly more than 5 bar as a is + ve.
Which combination of the following statements is correct?
P : A gas cools upon expansion only when its Joule-Thomson coefficient is positive in the temperature range of expansion.
Q : For a system undergoing a process, its entropy remains constant only when the process is reversible.
R : The work done by a closed system in an adiabatic is a point function S : A liquid expands upon freezing when the slope of its fusion curve on pressure-temperature diagram is negative.
Van der Waal’s equation of state is given by
The value of R in terms of Pc, Vc & Tc is
The equation of state
is known as
Virial expansion is given as
An ideal gas undergoes expansion according to the process PV0.5 = constant. The temperature of'the gas during expansion process
for expansion process, V2 > V1