reversible and irreversible processes

isochoric/isometric:
isothermal:
isobaric:

Moderators: Chem_Mod, Chem_Admin

marcus lin 1E
Posts: 54
Joined: Fri Sep 28, 2018 12:28 am

reversible and irreversible processes

Postby marcus lin 1E » Sun Feb 17, 2019 1:07 pm

what's the difference between reversible and irreversible?

Lauryn Shinno 2H
Posts: 59
Joined: Fri Sep 28, 2018 12:24 am

Re: reversible and irreversible processes

Postby Lauryn Shinno 2H » Sun Feb 17, 2019 1:25 pm

Reversible is expansion/compression against constant pressure, while irreversible is infinitesimal steps of expansion/compression against a changing pressure. Therefore, irreversible does more work, but does not actually happen in real life.

Samantha Ito 2E
Posts: 64
Joined: Fri Sep 28, 2018 12:29 am

Re: reversible and irreversible processes

Postby Samantha Ito 2E » Sun Feb 17, 2019 1:32 pm

Also, the work calculated for an irreversible expansion is w= -P∆V while the work calculated for a reversible expansion is w= -nRTln(V2/V1).

GavinAleshire1L
Posts: 29
Joined: Fri Sep 28, 2018 12:21 am

Re: reversible and irreversible processes

Postby GavinAleshire1L » Sun Feb 17, 2019 4:39 pm

Reversible processes are always in equilibrium with their surroundings and are ideal whereas irreversible processes can occur naturally and involve a definite change in entropy.

Kyither Min 2K
Posts: 60
Joined: Wed Oct 03, 2018 12:15 am

Re: reversible and irreversible processes

Postby Kyither Min 2K » Mon Feb 18, 2019 7:47 pm

Reversible processes are when the external pressure is changing in minuscule amounts and so the volume is changing in minuscule amounts and can return to it's original state. Irreversible processes have a constant external pressure so once it expands/compresses to a certain volume, it will stay the volume.

Jonathan Pai 2I
Posts: 121
Joined: Fri Sep 28, 2018 12:27 am

Re: reversible and irreversible processes

Postby Jonathan Pai 2I » Mon Feb 18, 2019 8:36 pm

reversible happens slowly so heat change can occur and the pressure usually is changing

KimGiang2F
Posts: 31
Joined: Fri Sep 28, 2018 12:19 am

Re: reversible and irreversible processes

Postby KimGiang2F » Tue Mar 12, 2019 3:35 am

A reversible process is one that can be reversed by an infinitely small change in a variable. Whereas an irreversible process is an expansion against an external pressure that differs by a finite amount from the pressure of a system. To get a better understanding of a reversible change, you can consider the reversible, isothermal expansion of an ideal gas. The pressure of the gas falls as it expands; so to achieve reversible expansion, the external pressure must be reduced in step with the change in volume so that at every stage, the external pressure is the same as the pressure of the gas. As you can see, the change in volume is the infinitely small change required for the expansion to be reversible. The work that a system can do is greatest in a reversible process.

Keerthana Sivathasan 2E
Posts: 101
Joined: Wed Sep 18, 2019 12:22 am

Re: reversible and irreversible processes

Postby Keerthana Sivathasan 2E » Mon Jan 27, 2020 2:55 pm

Reversible processes can make sense backwards and forwards, but for irreversible processes, there is a clear backward and forward. For example, throwing a chalk up in the air is reversible, but breaking an egg is irreversible.

Leila_4G
Posts: 114
Joined: Sat Sep 14, 2019 12:17 am

Re: reversible and irreversible processes

Postby Leila_4G » Tue Jan 28, 2020 7:45 pm

What are the implications of these reversible/irreversible processes?

805291863
Posts: 100
Joined: Sat Sep 14, 2019 12:16 am

Re: reversible and irreversible processes

Postby 805291863 » Sat Feb 01, 2020 2:15 pm

How will we be able to differentiate between a reversible and irreversible process on an exam? Will it be given to us or do we have to make the distinction?


Return to “Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)”

Who is online

Users browsing this forum: No registered users and 1 guest