The definition of enthalpy as a duty of warm capacity and temperature change. $\Delta H = C_p \Delta T$.

You are watching: De;ta/cp,

Does it only use at constant pressure? In mine discussions ~ above this board and likewise with web links elsewhere, that looks prefer this equation uses during the Carnot Cycle, whereby there is no consistent pressure.

Why is Cv provided in the adiabatic development of Carnot Cycle come calculate internal energy

http://chemwiki.ucdavis.edu/Physical_Chemistry/Thermodynamics/Thermodynamic_Cycles/Carnot_Cycle

I usually think this equation does not need constant pressure come apply. Yet today, when I to be going v Atkins physics Chemistry, it particularly says:

$\Delta H = C_p \Delta T$ (at continuous pressure)

equation 2B.6b. Ns think the constant pressure part is wrong, but this is a publication with 10 editions with 5 star evaluate on amazon.

http://www.amazon.com/gp/product/1429290196/

thermodynamics
share
cite
enhance this concern
follow
edited Apr 13 "17 at 12:39

CommunityBot
1
asked Aug 31 "15 at 20:13

Ted YuTed Yu
$\endgroup$
2
include a comment |

2
$\begingroup$
Certainly, friend agree $dH=C_P dT$ if we"re at constant pressure. If $H$ and also $C_P$ don"t actually depend on pressure, then you have the right to use this equation regardless of whether pressure changes. However, to recognize $C_P$ and $H$ you first need an equation of state (such as $PV=NkT$). Without learning the particular equation the state (aka, if her gas is right or not), you have the right to only say $dH=C_P dT$ at consistent pressure. However, in the details case the the ideal gas, you know that both $H$ and also $C_P$ don"t rely on $P$, and so friend can use the equation an ext generally.

re-publishing
mention
improve this prize
follow
edited Sep 1 "15 in ~ 2:59
answered Aug 31 "15 at 23:14

Jahan ClaesJahan Claes
$\endgroup$
8
| present 3 much more comments
1
$\begingroup$
Enthalpy is characterized as $H=U+pV$ whereby $U$ is the interior energy. This an interpretation has nothing to execute with pressure being constant or not. If the system under factor to consider has just pressure $p$ and also thermal $T$ inner variables and interaction v its setting (simple homogeneous system) then for continuous external push $dp=0$, and we have $dH = dU + pdV + Vdp = dU + pdV=\delta Q$ because of this $dH = C_p dT$

re-superstructure
cite
boost this price
follow
answer Aug 31 "15 in ~ 21:28

hyportnexhyportnex
$\endgroup$
8

Thanks for contributing response to medtox.org stack Exchange!

But avoid

Asking because that help, clarification, or responding to various other answers.Making statements based upon opinion; earlier them increase with recommendations or personal experience.

Use MathJax to layout equations. MathJax reference.

See more: Cuantos Mililitros Tiene Un Litro De Agua, ¿Cuántos Mililitros Hay En Un Litro De Agua

Draft saved

authorize up utilizing Email and also Password
send

### Post together a guest

name
email Required, but never shown

### Post together a guest

surname
email

Required, however never shown

## Not the answer you're feather for? Browse other questions tagged thermodynamics or asking your own question.

Featured top top Meta
2
Why is $C_v$ offered in the adiabatic growth of Carnot Cycle come calculate interior energy?
-2
First legislation of Thermodynamics in isochoric process
0
Does $U_v=U_p$ wherein $U_v$ and $U_p$ is adjust in internal power of mechanism at consistent volume and pressure, respectively?
-4
Please define the systems if it's correct
connected
5
Adiabatic proccess and Carnot cycle in a photon gas
0
Carnot Engine work from warmth Exchanger between Two Gas Streams
1
when to use $h = c_p\Delta T$ or $u = c_v\Delta T$
2
Why is $C_v$ used in the adiabatic development of Carnot Cycle to calculate interior energy?
5
Is existence of incompressible bodies prohibited through Carnot's theorem and also Clausius' inequality?
0
effectiveness of a 3 stage engine
1
$c_p - c_v$ proof
1
If $Q = mC_p\Delta T$, shouldn't $C_p$ be updated every increment?
hot Network questions more hot concerns

concern feed

medtox.org
company
ridge Exchange Network
site style / logo design © 2021 ridge Exchange Inc; user contributions licensed under cc by-sa. Rev2021.10.15.40479

medtox.org stack Exchange works finest with JavaScript enabled