## deltaU and deltaH

ng1D
Posts: 43
Joined: Wed Sep 18, 2019 12:17 am

### deltaU and deltaH

What are the differences and similarities between deltaU and deltaH?
Last edited by ng1D on Sun Feb 02, 2020 7:49 pm, edited 1 time in total.

Kaylee Sepulveda 4G
Posts: 100
Joined: Thu Jul 11, 2019 12:16 am

### Re: deltaU and deltaH

ΔH is the change in enthalpy and ΔU is the change in internal energy. Their relationship is explained by this equation: ΔH = ΔU + PΔV

Fatemah Yacoub 1F
Posts: 114
Joined: Thu Jul 11, 2019 12:16 am

### Re: deltaU and deltaH

delta U indicates constant volume while delta H Indicates constant pressure

kevinolvera1j
Posts: 103
Joined: Fri Aug 02, 2019 12:15 am

### Re: deltaU and deltaH

delta H corresponds to gases more because solids and liquids do not change a significant enough amount in volume.

KSong_1J
Posts: 101
Joined: Thu Jul 11, 2019 12:17 am

### Re: deltaU and deltaH

Delta U is the change in internal energy, while Delta H is the change in enthalpy. The internal energy of a system is the total energy in the system (sum of potential and kinetic energy) while enthalpy is the heat energy that is absorbed or released in a chemical reaction. They’re related in that the change in enthalpy is equal to the internal energy of a system plus the product of the pressure and volume. They’re similar in that they both are related to the energy exchange between a system and its surroundings.