Change in enthalpy

[Jua Ellie Ha 1K]

Dr. Lavelle defined enthalpy as "the amount of heat released or absorbed at a constant pressure." What effect would change in pressure have on enthalpy?

[Dashrit_Pandher_1J]

As the pressure of a system increases, so does the enthalpy. The same is true for when the pressure of a system decreases.

[Ava Ward 1K]

Pressure and enthalpy have a direct relationship so that as pressure increases, so does enthalpy. This is the same if pressure decreases, enthalpy decreases.

[Kelly Tang 1B]

Hi! Pressure and enthalpy are directly related so increasing one will increase the other (and vice versa). Since we want to focus on the enthalpy of fusion and vaporization, we keep the pressure constant to see how heat is released or absorbed during state changes.

[505685545]

As pressure increases, enthalpy increases. Vice versa, as pressure decreases, enthalpy decreases. Hope this helps!

[Octavio Santana 2H]

Enthalpy and pressure are directly proportional. This means that if enthalpy increases, then the pressure will increase. If enthalpy decreases, then the pressure will decrease.