Internal energy

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Valeria Viera 1B
Posts: 60
Joined: Fri Apr 06, 2018 11:05 am

Internal energy

Postby Valeria Viera 1B » Sun Feb 03, 2019 10:57 pm

What is internal energy and how do we find it?

Josephine Lu 4L
Posts: 62
Joined: Fri Sep 28, 2018 12:18 am

Re: Internal energy

Postby Josephine Lu 4L » Sun Feb 03, 2019 10:58 pm

Internal energy is a state property. It is found by adding q (heat) and w (work).

AnnaYan_1l
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Joined: Fri Apr 06, 2018 11:05 am
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Re: Internal energy

Postby AnnaYan_1l » Sun Feb 03, 2019 11:42 pm

According to my notes:
Internal energy, U, is a state property. So, changes in U are a function of initial and final states (delta U = Ufinal - U initial). The energy of a closed system can be changed by heating/cooling or compression/expansion. Delta U = energy transferred by heating (+q) + energy transferred by compression (+w) = q + w

josephperez_2C
Posts: 70
Joined: Wed Nov 15, 2017 3:04 am

Re: Internal energy

Postby josephperez_2C » Mon Feb 04, 2019 12:05 am

the internal energy of a system is the energy within the system, of the entire system, as well as the potential energy of the system as a whole due to external force fields

Phil Timoteo 1K
Posts: 101
Joined: Fri Apr 06, 2018 11:05 am

Re: Internal energy

Postby Phil Timoteo 1K » Mon Feb 04, 2019 1:36 am

Internal energy is the energy within a system. It is calculated by adding q+w

megan blatt 2B
Posts: 61
Joined: Fri Sep 28, 2018 12:28 am

Re: Internal energy

Postby megan blatt 2B » Wed Feb 06, 2019 7:47 am

Internal energy is the energy within the system and is calculated by adding q and w together. It can't be calculated at a single point in time, but the change in internal energy can be calculated. At constant pressure, the change in internal energy is equal to the enthalpy minus pressure times change in volume, which can be derived by substituting the equations for q and w.


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