Enthalpy
Enthalpy is a concept used in thermodynamics to understand the total heat content of a system. It is a state function that depends only on the prevailing equilibrium state identified by the system's internal energy, pressure, and volume. It is an extensive quantity.
Definition[edit | edit source]
The enthalpy of a system is defined as the sum of its internal energy U and the product of its pressure P and volume V. The equation for enthalpy H is:
- H = U + PV
Understanding Enthalpy[edit | edit source]
Enthalpy is a measure of the total energy of a thermodynamic system. It includes the internal energy, which is the energy required to create a system, and the amount of energy required to make room for it by displacing its environment and establishing its volume and pressure.
Enthalpy Change[edit | edit source]
The change in enthalpy (ΔH) of a reaction is a useful quantity, as it is directly measurable. It is the energy transferred from the system to its surroundings, or vice versa, in a process that takes place at constant pressure.
Enthalpy in Chemical Reactions[edit | edit source]
In chemical reactions, the enthalpy of reaction indicates whether a reaction is exothermic (releases heat, ΔH < 0) or endothermic (absorbs heat, ΔH > 0).
See Also[edit | edit source]
Enthalpy Resources | ||
---|---|---|
|
|
Translate to: East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
Urdu,
বাংলা,
తెలుగు,
தமிழ்,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
European
español,
Deutsch,
français,
русский,
português do Brasil,
Italian,
polski
Navigation: Wellness - Encyclopedia - Health topics - Disease Index - Drugs - World Directory - Gray's Anatomy - Keto diet - Recipes
Search WikiMD
Ad.Tired of being Overweight? Try W8MD's physician weight loss program.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro) available.
Advertise on WikiMD
WikiMD is not a substitute for professional medical advice. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates Wikipedia, licensed under CC BY SA or similar.Contributors: Admin, Prab R. Tumpati, MD