S there a way to calculate this using the thermodynamic identity?

Shaybay92
Messages
122
Reaction score
0

Homework Statement


A liter of air, initially at room temperature and atmospheric pressure, is heated at constant pressure until it doubles in volume. Calculate the increase in its entropy during this process.

Is there a way to calculate this using the thermodynamic identity (ie. without the Sackur Tetrode equation??) I was trying to use this formula, setting dV = V_initial... Any ideas?

dS = (dS/dU)dU + (dS/dV)dV
 
Physics news on Phys.org
Shaybay92 said:

Homework Statement


A liter of air, initially at room temperature and atmospheric pressure, is heated at constant pressure until it doubles in volume. Calculate the increase in its entropy during this process.

Is there a way to calculate this using the thermodynamic identity (ie. without the Sackur Tetrode equation??) I was trying to use this formula, setting dV = V_initial... Any ideas?

dS = (dS/dU)dU + (dS/dV)dV
What is the matter with:

\Delta S = \int dQ_{rev}/T = nC_p\ln(T_f/T_i) ?

AM
 

Thread 'Direction of the magnetic field of an oscillating charge'

Hello everyone, I’m considering a point charge q that oscillates harmonically about the origin along the z-axis, e.g. $$z_{q}(t)= A\sin(wt)$$ In a strongly simplified / quasi-instantaneous approximation I ignore retardation and take the electric field at the position ##r=(x,y,z)## simply to be the “Coulomb field at the charge’s instantaneous position”: $$E(r,t)=\frac{q}{4\pi\varepsilon_{0}}\frac{r-r_{q}(t)}{||r-r_{q}(t)||^{3}}$$ with $$r_{q}(t)=(0,0,z_{q}(t))$$ (I’m aware this isn’t...
View full post »

Thread 'Initial conditions for orbits around a wormhole'

Hi, I had an exam and I completely messed up a problem. Especially one part which was necessary for the rest of the problem. Basically, I have a wormhole metric: $$(ds)^2 = -(dt)^2 + (dr)^2 + (r^2 + b^2)( (d\theta)^2 + sin^2 \theta (d\phi)^2 )$$ Where ##b=1## with an orbit only in the equatorial plane. We also know from the question that the orbit must satisfy this relationship: $$\varepsilon = \frac{1}{2} (\frac{dr}{d\tau})^2 + V_{eff}(r)$$ Ultimately, I was tasked to find the initial...
View full post »

Similar threads

Thermodynamics: Possible process between a van der Waals gas and an ideal gas
Replies
1
Views
2K
I Understand the Thermodynamic Identity: Is This Correct?
Replies
3
Views
2K
Adiabatic Reversible Compression of a Solid
Replies
16
Views
4K
DeltaG and DeltaA calculation for heating a gas at constant volume
Replies
3
Views
2K
Free expansion of Real Gases - Dieterici EoS, Change in Temperature
Replies
30
Views
4K
Thermal Physics problem: Van der Waals
Replies
10
Views
2K
Adding heat to a Non Ideal Gas problem
Replies
5
Views
2K
Find the change in entropy for an ideal gas undergoing a reversible process
Replies
3
Views
2K
Chemistry No heat exchange with the surroundings in an irreversible expansion of an ideal gas?
Replies
4
Views
2K
Is the Entropy in a Free Expansion Affected by the Gas Type?
Replies
8
Views
2K

Hot Threads

Recent Insights

Back
Top