Isothermal Definition and 216 Threads

:confused: :confused: i was reading my lecture note over the half term but i am still a bit confused and i was wondering if someone could describe in detail, using a p-v diagram, a well known engineering cycle which specifies a isothermal or adiabatic process. Thanks you very much

I need to give examples of an instance in which temperature remains constant when heat flows in and out of a system, isothermal by definition. I know the textbook example (slowly heating an ideal gas in a cylinder with a piston on one end, volume increases as pressure decreases, etc.), but are...

Homework Statement A gas obeys the Van Der Waal equation of state. The gas undergoes a free expansion from volume Vi to Vf at a constant temperature T. Find the change in entropy of the gas.Homework Equations du=Tds-Pdv+mdn The Attempt at a Solution I can solve the problem assuming du= 0 but...

Suppose 145 moles of a monatomic ideal gas undergo an isothermal expansion from 1.00m^3 to 4.00m^3, as shown in figure. what is the temp at the beginning and end of this process? how much work is done by the gas during the expansion? http://www.physics.brocku.ca/Courses/1p23/images/FG18_24.JPG...

Here's my problem: 300 calories of heat are added to a gas as the internal energy of the gas increases by 500 calories. The described thermodynamic process is best described as? My guess is that the process is isothermal b/c work is being done in the system.

I got stuck on the following problem, which is very important for my exam preparations - would anyone mind giving me a hint? A balloon of Volume V(0) is tethered to the ground using a light cable. It is filled with helium gas of density rho (He). At ground level the pressure and density in...

have a question. the viral eqn of state for one mole of aragon is: pV=RT(1+B/V +c/V^2) T is known and so is B and C. but p is not known. initial V is known and so is final V. the question is "find out the work of a reversible isothermal expansion at this temperature" Know I'm wondering is...

I am trying to make the connection from statistical mechanics to thermodynamics for the isothermal isobaric ensemble. Partition function = (sum of)exp(-BEj-gamma*Vj). I have followed T.L. Hill [Statistical Mechanics, p. 67] but can not understand how he justifies dE=(sum of)EdP, rather than...

Hi all, I have currently been reading up on dark matter halos as I’m considering doing a small project on them for my degree. I plan to use an (approximated) analytical equation for the density at r of an isothermal halo in terms of the halos central density and core radius. density(r) =...

ok i really don't understand this question, especially about finding the functions for the recompressed isothermal and about the recompression stuff, I am just stuck An ideal monatomic gas is expanded from initial volume V1 = 1 litre, P1 = 2atm, and T1 = 300K to a volume V2 = 2 litres, and P2...

If air has a pressure of 40 psig and a volume of 8 cu. ft. expands isothermally to a pressure of 10 psig, find the external work performed during the expansion. How do I do this, do I first have to change 40 psig to psia, and how do I do that? This question has me lost! Any help appreciated...

Hello, I have what should be an easy problem, but I, of course, am having some issues. Here's the problem: The temperature of 2 moles if an ideal gas is 380 K. How much work does the gas do in expanding isothermally to 3 times its initial volume? So I know I'm going to to need to use...

How would I show that during quastatic isothermal expansion of a monatomic ideal gas, the change in entropy is related to the heat input Q by the simple formula: delta S=Q/T Show that it is not valid for the free expansion process described. Answer: Putting heat into a system always...

I need equations for Isothermal compressibility & Volume expansitivity in terms of temperature and pressure. Please help. It is for refrigerants in both liquid but especially gaseous phase. Ade:wink:

Hello forum members I need some help on H.W problem...just enough reasoning to atleast get started the question is as follows: 5 moles of a monoatomic ideal gas at an initial volume of .50 m^3 and an initial pressure of 2.0 * 10^5 Pa undergoes an isothermal compression to .20m^3. Find...

Hello again, Last question for a while kinda confused between these two. Let's say i have these two processes, the internal energy of a system is removed(isothermal) and decreases by 50J(both of them). Now for isothermal Q=W which would tell me that work equals 50J, correct and...