How do I change my Cv to CP?
cp = cv + R
The specific heat constants for constant pressure and constant volume processes are related to the gas constant for a given gas.
How do you know when to use CP or Cv?
Use Cv when there’s constant volume. This is the specific heat when there’s constant volume. Use Cp when there’s constant pressure. This is the specific heat when there’s constant pressure.
Why is Cv same as CP?
For solids and most liquids cp is approximately equal to cv. The difference is that gases are compressible–that is, they change their specific volume relatively easily. So when we add heat to a gas it will expand unless we constrain it.
What is Cv in Isochoric process?
Cv is specific heat for constant volume and Cp is for constant pressure. You apply them according to these conditions. In Isochoric process only Cv is relevant since it is constant volume process.
For which gas is equal to Cp by Cv?
an ideal gas
For an ideal gas CP−CV=R. It is the difference between the heat capacity at constant pressure and the heat capacity at constant volume.
Why is the value of Cp always greater than Cv?
Cp is greater than the molar specific heat at constant volume Cv because energy must now be supplied not only to raise the temperature of the gas but also for the gas to do work.
Is CP Cv for all gases?
As explained, Cp is always more than Cv because when heat is added at constant pressure, the substance expands and works. P ∆V = n R ∆T. This signifies as said above Cp always exceeds Cv by an amount n R [ n is moles of gas and R is the universal gas constant.
Why does CP exceed Cv for an ideal gas?
Can CP be less than CV?
Because work is done to the contracting water, less heat is required to increase the water temperature in an isobaric process than in an isochoric process. Therefore, CP is less than CV.
Can CP ever be less than CV if so give an example?
Under constant volume, all heat goes into internal energy. In this example, water contracts upon heating, so if we add heat at constant pressure, work is done on the water by surroundings and therefore, CP is less than CV”.
What remains constant in isobaric process?
An isobaric process is a process occurring at constant pressure. The first law of thermodynamic equation for the isobaric process remains the same as the pressure remains constant and because of the volume change, the system does work.
What is the work done in isobaric process?
Work Done by a Gas in an Isobaric Process
V f > V i , so ΔV > 0 and the work done by the gas is positive. so that ΔV < 0, and the work that is done by the gas is negative. The work done by the gas is represented on the P-V diagram by the rectangular area under the isobaric path on the diagram.
Why Cp is greater than Cv for a gas?
At constant pressure, when a gas is heated, work is done to overcome the pressure and there is an expansion in the volume with an increase in the internal energy of the system. Therefore, it can be said that Cp is greater than Cv.
Can Cp Cv be valid for a liquid?
Cp and cv exist for compressible media (which we do not neglect the compressibility). This is usually the case of gas, but it can also be one of liquids and deformable solids.
Can CP be less than Cv?
Can CP ever be less than Cv if so give an example?
Why CP is greater than Cv for a gas?
When gas is heated at a constant volume, it increases the internal energy of the system. When a gas is heated at constant pressure, expansion in the volume with an increase in the internal energy of the system takes place.
Can Cv be greater than CP?
Therefore, CP is less than CV.
Is Cv always bigger than CP?
CP is always greater than CV in gases.
Can CV be greater than CP?
Is CV always bigger than CP?
What is the formula for isobaric process?
An isobaric process is a process that occurs at constant pressure. We then have W = P(V2 – V1). If the pressure of an ideal gas is kept constant, then the temperature must increase as the gas expands. (PV/T = constant.)
Is work done zero in isobaric process?
Work done is equal to zero in an Isobaric process.
How do you calculate work done in isobaric expansion?
Isobaric Process Thermodynamics – Work & Heat Energy – YouTube