∆U = 0

[Sasha Gladkikh 2A]

When is ∆U = 0?

[Austin_Schwartz_1L]

Hello,
∆U = 0 when there q+w=0, which means that there is no heat being exchanged between the system and the surroundings and there is also no work being done by expansion.
I hope this helps!

[carterwink2K]

delta U is equal to q + w. This means that when delta U is 0, q + w is also 0. So, if the net heat transfer is equal and opposite to the net work done, then delta U will be zero. Typically, both of these values are 0 for this to happen.

[Josephine B 3L]

Hi!

DeltaU is zero for isolated systems. This is because the energy of an isolated system must remain constant because no matter or heat can be transferred and the system can't be physically changed. When this happens for isothermal reversible expansion equations, the miniscule change in heat is equal to the work done by the system. -q=w

Hope this helps!

[Caden Ciraulo 1J]

∆U=0 when there is no change in internal energy. This can happen anytime that -q=w so q+w=0 because q+w=∆U, so you know from the equation that ∆U will be zero, and you can understand that since no net change has occurred, there is no change in internal energy.

[zackdouchy]

Delta U=0 for isolated systems since an isolated system cannot exchange matter or energy with its environment it therefore cannot have an internal energy change. Moreover, the fact that the change in internal energy of isolated system is equal to 0 postulates the first law of thermodynamics stating that the internal energy of an isolated system remains constant.

[A 3F]

When ∆U = 0 and ∆U = q + w, this would imply that q = -w. If the system is doing work, then it is losing energy. However, the energy lost is replaced by heat flow (q) into the system at the same time. This would keep the system at equilibrium, and there is no change in internal energy.

[Chelsea Tran 3H]

∆U = 0 in an isolated system, since the energy of an isolated system must remain constant and the system can't be physically changed.

[Nandini_Parmar_1I]

This is when there is no heat being exchanged. Therefore there can be no internal energy change if there is no heat. No change in internal energy as a result.

[Anthony_Rio_3K]

ΔU=0 means there is no change in internal energy. This happens for isolated systems where energy, matter, and heat cannot be exchanged from inside and outside the system.

[Martha Avila 1I]

Hello! Delta U is going to be zero in an isolated system. So we know that Delta U is equal to q + w. This would mean that there is no heat being exchanged from the system to surroundings. There is also no work (w) being done to the system either. Hope this helps.

[Jessica Sun 2I]

Delta U = 0 when there is no change in internal energy. This means that the system must be an isolated system as no matter or heat can be transferred in an isolated system.

[Kaitlyn_Urquilla_1I]

Hi! Delta U = 0 when the internal energy stays the same which means that w = -q.

[LouiseLin2L]

Delta U is 0 when q+w is 0 because q+w=delta U; or when q=-w under an isothermal reaction. When delta U=0, internal energy does not change.

[Alice Weber 3I]

Hi. ∆U = 0 when there is no change in internal energy or in an isolated system.

[Nithya Narapa Reddy]

Internal energy is calculated by adding w(work) + q. This means that whenever there is no work being done on the system or heat being exchanged delta u is zero. Delta U is 0 for isolated systems.

[Tara Cumiskey 3K]

It equals zero when you have an isolated system or when there is no work done on the system and no heat exchanged.

[Nicole Weinstein 3E]

This occurs in isolated systems. Since delta U=q+w, when there is no matter or energy being exchanged through heat or expansion/compression (work), q=0 and w=0. Therefore, delta U=0.

[Mara Crooks 1F]

∆U = 0 would be mainly in isolated systems so when there is no heat exchanged (q) and no work being done (w) where ∆U = q + w.

[Alan Nguyen 2I]

U is a variable that represents internal energy. The Greek letter delta means "change in," which indicates that delta U means change in internal energy. By definition, isolated systems do not experience a change in internal energy, making delta U equal to zero.

[Christina Gigoux 1D]

Delta U will equal 0 either when q = -w or q = w = 0 because of the equation delta U = q + w.

[Evan L 2B]

∆U = 0 when there is no work done or heat added since ∆U = q + w. This happens in isolated systems because no heat can be transferred and no work is done either.

[Thailer Phorn 1C]

∆U = 0 when heat is not being transferred in or out of a system and there is also no work being done.

[Albert Chen 1G]

Delta U would = 0 in an isolated system because there is no exchange of matter or heat. Therefore, there is no change in internal energy in the system.

[Olivia Peony Dis 2A]

Delta U is zero when q=-w or when there is no exchange of matter or energy (isolated systems)

[Joellen 1B]

When delta U is zero, that means that the energy transferred as heat is equal to the opposite of work done. It means that the system is isolated; there is no energy or matter being exchanged.

[Xzandalyn Kallstrom 2C]

∆U = 0 when there is no change in internal energy, or when q and w are both 0. Theres usually no change in internal energy in isolated systems, because energy can't be transferred and there is no work done. ∆U = q+w or -q=w

[Achyutha Kodavatikanti_3H]

∆U = 0 when q + w = 0, which is when -q = w.

[Prithvi Raj 3E]

Delta U tends to be 0 for closed systems. But you can also have no internal energy is your enthalpy and work cancel each other.

[Brenda Tran 3C]

Delta U is zero when the heat (q) and work (w) are both 0 or amount to zero.

[Chris Van 2J]

Delta u is equal to zero when there is no change in internal energy or when heat (q) and work (w) are both zero.

[Collin Le 3I]

Delta U can be zero in isolates systems where there is not transfer of heat or work done.

[Lauren Wasef 3C]

In an isolated system, ∆U = 0. Both heat and work are 0!

[emily3L]

This can occur in an isolated system when no work or heat transfer.

[Daniel Tabibian 3K]

Delta U would equal zero when q+w = 0. This could mean them cancelling each other out or in the case of an isolated system, both of them equaling zero.

[Ameerah Hameed 3B]

∆U = 0 when both heat (q) and work (w) are equivalent to zero (no internal energy).

[Ivan Huang Dis 3B]

if q is equal to -w then u would be zero because delta u is the sum of the two

[indigoaustin 3H]

When ∆U=0, this means there is no change in energy. This occurs when both heat and work are equal to 0 or when they are opposites so they cancel each other out.

[Hannah_Pon_1F]

For an isolated system, ∆U=0 because there will no change in q or w.

[Macy_Anderson_2F]

The change in internal energy = 0 when there is no work or heat. This occurs in isolated systems. This principle is also the basis for the first law of thermodynamics.

[Nyah Zhang 1E]

Delta U is zero when there is no change in internal energy in a system. When q is equal to -w, the system will have a delta U of 0.

[Kimberly_martinez2I]

Delta U is zero when there is no change in the internal energy and where is no work or heat transfer which occurs in isolated system.

[Coraly De Leon]

Hey !
Delta U will be 0 when temperature stays constant.

[505734174]

delta U = 0 when there is no exchange of work or heat so the internal energy does not change, ie in an isolated system.

[505706331]

delta u = 0 when both q and w are 0 or if the heat cancels out with the work

[Aanjaneyaa]

The delta U would be 0 when both q and w are 0. This can happen in multiple scenarios.

[Isabella Yee 1F]

Delta U = 0 in a perfectly isolated system because there is no exchange of matter or energy between the system and its surroundings.

[Hannah Carsey 1B]

∆U = 0 in an isolated system because in an isolated system there is no exchange of matter or energy (in the form of heat or work) between the system and the surroundings (an isolated system is only perfectly isolated in theory / hypothetically), and so (heat exchange) q = 0 and (work) w = 0, (change in internal energy) ∆U = q + w = 0 + 0 = 0, ∆U = 0.

[SuryaDham 3E]

Delta U equals 0 when no work is done on or by the system, and there is no heat transfer within the system, usually this is a perfectly isolated system.

[Caleb_Mei_1J]

Hey there!

Delta U is equal to zero in an isolated system, meaning that no work or heat can be transferred. In this case, q + w = 0, meaning that delta U would be 0.

I hope this helps!

[Anne Nguyen 3H]

hi!
∆U = 0 defines an isolated system when no work or heat is being done or transferred. This would also mean that q + w = 0

[Matthew Vu 3C]

Delta u = 0 when there's no change in internal energy, meaning no change in q or w. No heat is transferred and no work is done

[Molly Smith 1J]

Delta U will equal zero when a) q and w cancel out or b) when no heat is entering or leaving system and no work is being done. This is because delta U= q+w

[Jordyn Lee 1J]

This means that there is no change in internal energy in a system. This would also mean the there is no change in heat or work by the system.

[Caitlyn Lo 2F]

Delta U happens when there is no internal energy which means that q and w cancel each other out since the equation for delta U = q+w. This means no heat was transferred and no work was done.

[Talia Tam 3L]

Delta U = 0 when q + w = 0, or q = -w. When delta U = 0, there is no change in internal energy.

[Skylar Lo 2C]

delta U is equal to q + w so when delta U is 0, q and w are opposite inverses on each other. Basically, net heat transfer is equal to net work done.

[305670352]

∆U = 0 is when there's no heat exchange between the system and the surroundings as well as no work done by expansion

[Mahli Martinez 2I]

∆U=0 in an isolated system, when there is no internal energy change. There would be no changed in the work or heat by the system.

[Diana Avalos]

ΔU=0 can occur in an isolated system, as w=0 and q=0 because there is no heat transfer or work being done by or on the system.

[Rebekah Jung 1C]

Delta U = 0 is for when no work is being done by or on a system, thus making q + w = 0. This applies to isolated systems.

[Akshat Katoch 2K]

∆U = 0 when both w and q are equal to 0. ∆U = w + q so if both are 0 then 0 + 0 = 0.

[Holly Do 2J]

I believe that there can be different ways in which delta U=0.
#1. Since deltaU=q+w, if q and w are opposites of each other, when we add them together we would get 0.
#2. During isolated systems, no work is being done on the system and thus the internal energy should not change and thus delta U=0.

[Sabira Mohammed 3I]

U = 0 when q = 0 (no heat transfer) and w = 0 (no work done). This occurs in isolated systems, which can't exchange matter or energy.

[oliviahelou]

delta U = 0 only when w + q = 0, or in isolated systems as there is no change in internal energy (first law of thermodynamics)

[Darren Apostol 2L]

When internal energy hasn't changed, which is true for isolated systems. Or in the cases where q + w = 0.

[Renga Rengappa 1D]

It’s when q=-w or the reverse.

[Macy_Anderson_2F]

Delta U = 0 when q + w = 0

[Allen Lu 2F]

Change in U is 0 when q and w both add up to equal to 0. This ultimately means that either work and heat are canceling each other out or that they are both at a 0 value.

[Ashwin Vasudevan 3A]

∆U = 0 when there is no heat transfer or work being done.

[maya 3f]

delta U is 0 when no work is done on the internal system, so when no heat is added or removed.

[Polo Morales 3C]

Delta U = 0 when w=-q. Since the equation is deltaU = w+q. Hope this helps!

[Abby 2B]

hi, internal energy is 0 when the system is not exchanging heat or work with the surroundings, like in an isolated system.

[Hannah Choi 1K]

∆U when both heat and work are equal to 0, which is the case in isolated systems that have have no heat transfer and no work being done.

[205819952]

When there is no change in internal energy or when the system is isolated, deltaU = 0.

[kaylasaens2A]

∆U = 0 when there is no heat transfer and no work being done on the surroundings. This essentially means that there is no change in internal energy.

[Tristan Friet 3G]

Internal energy is 0 for isothermal processes in reversible expansion (when q=-w). Also when the change in heat and the energy in form of work is 0, the change in internal energy is 0.

[eve444]

∆U = 0 usually equals 0 when there is no heat transferred (isothermal). This denotes there isn't a change in internal energy and no work being done on the surroundings.

[Zoe Staggs 3B]

When, dU=0 the work done by the system is equal to the heat gained by the system or the work done on the system is equal to the heat lost by the system. When there is no heat transfer and no work done, the internal energy does not change.

[Yalit Gonzalez 1A]

delta U in an isolated system means that there is no heat transferred to and from the system, also means that there's no work being done. When q=0 and w=0, delta U is zero

[Saba Honarvar 3A]

∆U = 0 in an isolated system, and when there is no heat transferring and since the energy of an isolated system must remain constant and the system can't be physically changed. And so no heat is being added or removed which makes it isolated.

[Courtney Machler 1J]

∆U refers to the change in the system's internal energy, so when ∆U is 0, there is no change in the internal energy of the system. ∆U is 0 when heat is equal and opposite signs of the work done on the system. So when heat and work cancel each other out, there will be no change to the internal energy of the system. It is also important to note that, if the temperature is constant, then there will be no change in internal energy in a closed system (thus, ∆U=0).

[Harsha Kancharla 2E]

∆U = 0 when the internal energy within the system is not altered at all, which means the temperature is not changing. Since q + w = ∆U, when ∆U=0, q + w = 0. No heat is leaving the system and no heat is being absorbed by the system.

[505769291]

Since delta U equals q (energy transferred by heating) + w (energy transferred by compression), when both of these are 0 delta U will also be 0.

[Janvi Bharucha 3D]

Delta U = 0 if q + w = 0. That means that together the heat and the work of the system amount to 0.