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Because Cp has two functions:-
1-To change the internal energy dU.
2-To do work dW in expanding the gas.
Where as Cv has only one function of changing the internal energy of the gas..by awais
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∙ 12y ago
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Why the value of cp and cv is different for different gases?
Cp=cv
How do you derive the equation cp-cv equals R?
cp-cv =R proved that//
Why Cp is greater than Cv?
Because Cp has two functions:- 1-To change the internal energy dU. 2-To do work dW in expanding the gas. Where as Cv has only one function of changing the internal energy of the gas....by Hamoud Seif
What Cv and Cp of air?
1.005
Why cp and cv have different values?
Cv is a for a constant volume, and there is therefore no work done in the expansion whereas as Cp accounts for the work done by the gas during its expansion, as well as the change in its internal energy. Thusly Cp is generally bigger than Cv. Intuitively this would be very simple to work out yourself. We used to have to work this out ourselves back in my day, not just resort to cheap answers on the interweb.
Does the relation Cp minus Cv equal R hold true for solids and liquids Why or why not?
No, this relation is ONLY for ideal gases. The difference between Cp and Cv can be written more generally as T*(dP/dT)v*(dV/dT)p, where the lower case v and p represent the derivatives taken at constant volume and pressure, respectively. If you take these two derivatives using the ideal gas law (PV=nRT), then the result simplifies to Cp-Cv=R. However, solids and liquids do not follow the ideal gas law, and the difference between Cp and Cv is much smaller... negligible in many cases. For solids, Cp-Cv can be calculated using the isobaric expansivity, isothermal compressibility, and density of the material.
Give expression for efficiency of dual cycle?
= 1 - qout/qin = 1 - cv(T4-T1)/(cv(Tx-T2)+cp(T3-Tx))
Explain how you can determine the atomicity of a gas?
To find the atomicity of an ideal gas you can use γ = Cp/Cv.
What is Mayer's formula?
Cp-Cv is the relation of Mayer's formula. It can also be defined in words as the difference between two specific heat capacities.
How do you prove the Potential density equation?
(rho/potential_density) = (p/reference pressure)^(1/gamma) where gamma is the ratio of specific heats Cp/Cv = 1.40.
When is equivalent variation greater than the Compensated variation When also is compensated variation be greater than the equivalent variation?
When goods are normal, CV > EV.
Why has a gas two values of molar heat capacities?
Gasses have two specific heat capacities because the boundary conditions can affect the number by up to 60%. Therefore, a number is given to each boundary condition: isobaric (constant pressure) or isochoric (constant volume). In an ideal gas, they differ by the quantity R (the gas constant - the same one you use in the ideal gas law): Cp = Cv + R where Cp is the isobaric molar heat capacity (specific heat) and Cv is the isochoric molar heat capacity.
