Delta U

[Ellis Song 4I]

What exactly is ? I know it means internal energy but I'm not sure what that means.

[DarrenKim_1H]

It refers to the energy contained within a system

[DarrenKim_1H]

So basically, U = q + w refers to the fact that it is the total energy that the system is involved with, i.e the energy from the heat generated or loss plus the energy of the work done on or against the system

[805097738]

this is the internal energy of the system. so w would be the work either done by or on the system and q would be the heat either absorbed or given off by the system. the changes are looked at in the perspective of the system

[Subashni Rajiv 1K]

When solving for internal energy, it is helpful to keep track of the terms given in relation to the system and not the surroundings.

[Jainam Shah 4I]

Delta U is basically the internal energy of the system. When a system is isolated the delta U cannot change. Delta U changes by an input of energy via heat transfer or work due to compression/expansion.

[Dina Marchenko 2J]

It's important to remember than delta U is the change in internal energy rather than just the internal energy of a system. It's a state function that looks at how the internal energy of a system changes over the course of a process (if a system releases or absorbs energy).

[Rebekah Alfred 1J]

Changes in internal energy are a function of initial and final states. When delta U is zero, a gas still can expand because it is a spontaneous process with an entropy increase.

[805383532]

Delta U is the change in internal energy. Internal energy is the energy contained within a system.