The work done by Thermodynamic processes

In summary, the conversation discusses the ranking of thermodynamic processes in terms of work done during compression or expansion. The processes of adiabatic, isothermal, and isobaric are compared and their relationship to internal energy and heat flow is explained. The conversation also clarifies that the discussion is focused on reversible processes.
  • #1
AhmedHesham
96
11
Hi gentlemen
I want to know the classification of thermodynamic processes according to which is higher than which in work done during either compression or expansion.
Thermodynamic processes like isentropic and isobaric.
Thanks
 
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  • #2
Hi Ahmed. (try to avoid gender specific salutations. PF welcomes people of all genders). Your question is not very clear. If you want to compare a compression of the same quantities of an ideal gas at the same initial volume and pressure to the same final volume using different processes, the ranking from highest to lowest amount of work done would be:
Adiabatic;
Isothermal;
Isobaric.

Since they begin at the same internal energy and since there will be no heat flow into the gas during compression, you can determine the amount of work done by comparing the change in internal energy using:
##W = \Delta U - Q## where W is the work done ON the gas and Q is the heat flow INTO the gas

Since there is no heat flow into the gas, Q ≤ 0.

The internal energy of an ideal gas is proportional to T and PV: ##\Delta U = nC_v\Delta T = (C_v/R)\Delta(PV)##

AM
 
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  • #3
AhmedHesham said:
Hi gentlemen
I want to know the classification of thermodynamic processes according to which is higher than which in work done during either compression or expansion.
Thermodynamic processes like isentropic and isobaric.
Thanks
I assume you are asking about reversible processes, correct?
 
  • #4
Thank you very much guys for answering
I now understand it
 

What is the definition of work in thermodynamics?

The work done by a thermodynamic process is the energy transferred to or from a system through mechanical means, such as pressure-volume work or shaft work.

How is work related to the first law of thermodynamics?

The first law of thermodynamics states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system. This means that work is an essential component in understanding energy changes in a thermodynamic process.

What are the different types of work in thermodynamics?

There are three main types of work in thermodynamics: pressure-volume work, shaft work, and electrical work. Pressure-volume work involves changes in volume and pressure of a gas, shaft work involves mechanical work done by a rotating shaft, and electrical work involves the movement of charge through an electric field.

How is work calculated in thermodynamic processes?

The amount of work done in a thermodynamic process is calculated by multiplying the force applied to the system by the distance over which the force is applied. In the case of pressure-volume work, this is represented by the formula W = -PΔV, where P is the pressure and ΔV is the change in volume.

What is the significance of work in thermodynamics?

Work is a crucial concept in thermodynamics as it allows us to understand and quantify the energy changes in a system. It also helps us to analyze and optimize processes in various industries, such as power generation and refrigeration. Additionally, the concept of work is closely related to the laws of thermodynamics, providing a deeper understanding of these fundamental principles.

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