negative Delta U

[BAlvarado_1L]

if you burn fuel what does it mean conceptually for the Delta U to be negative? can the system then not do work?

[Connie Chen 1E]

Internal energy is the total store of energy in a system. When you burn fuel, that energy is released, so the final internal energy of the system will be less than the initial, resulting in a negative delta U.

[Fatemah Yacoub 1F]

If you burn fuel you have a lot of heat lost, meaning the internal energy decrease, but since the energy is lost as heat it does not increase the capacity to do work.

[805307623]

If the temp of the gas decreases, the gas molecules slow down, and the internal energy of the gas decreases. This means that ΔU is negative.

[Leslie Almaraz 4G]

are there any other cases where the change in internal energy will be negative?

[Rebekah Alfred 1J]

A negative delta U occurs when the final internal energy is lower than the initial internal energy.