Enthalpy (H) is defined so that changes in enthalpy (H) are equal to the heat absorbed or released by a process running at constant pressure. While changes in enthalpy can be measured using calorimetr [..]

1927 in physics, from Greek enthalpein "to warm in," from en "in" (see en- (2)) + thalpein "to heat," from thalpos "warmth, heat," especially "summer heat. [..]

A thermodynamic state function H defined as where U is the internal energy, p is pressure, and V is volume. Specific enthalpy of a homogeneous system, h, is its enthalpy divided by its mass, m, define [..]

Enthalpy is a thermodynamic property of a system. It is the sum of the internal energy added to the product of the pressure and volume of the system. It reflects the capacity to do non-mechanical work [..]

The sum of the total internal energy required to create a system, and an extra term for the amount of energy required to make room for it (by displacing volume and pressure). Therefore during an isobaric (same pressure) process, the change in enthalpy is equal to the heat transferred during the process. It is an extensive quantity. Its absolute val [..]

The thermodynamic property of a substance defined as its total internal energy plus the total heat & heat content Pv/J. Sometimes called total heat and heat content.

Enthalpy is the amount of thermal energy which is released (exothermic) or consumed (endothermic) during a process which takes place at constant pressure.

(n) (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure

Total amount of heat in one pound (kg) of a substance calculated from accepted temperature base, expressed in BTU's per pound mass (J/kg).

The amount of energy released or absorbed by a chemical reaction. The "Free Enthalpy" (also called the " Change in Gibbs Free Energy") in a reaction is the maximum [..]

Heat; in a chemical reaction, the enthalpy of the reactants or products is equal to their total bond energies.

Total amount of heat in one pound (kg) of a substance calculated from accepted temperature base, expressed in BTU’s per pound mass (J/kg).

total amount of heat in one pound of a substance calculated from accepted temperature base, expressed in btu’s per pound mass.

Heat that is comprised of the internal energy plus the work done.

Change in heat at constant pressure.

Illustrated Glossary of Organic Chemistry Enthalpy (H): The total energy of a system. In introductory organic chemistry, a useful simplification is to think of enthalpy as the total energy contained w [..]

A measure of the total internal energy of a system. As enthalpy cannot be measured directly, quantities are typically presented as a change in enthalpy over a given process. Enthalpy change takes into [..]

The total heat contained in a refrigerant at any given temperature.

The total quantity of energy used to heat or cool a substance between two temperatures including the energy used to change the state of the substance if applicable. For example, if we heat a sample of water at normal atmospheric pressure from (1°C to 135°C), the enthalpy is the sum of the sensible heat energy added (1°C to 100°C and from 100°C to  [..]

Heat content or total heat, including both sensible and latent heat. The amount of heat contained in a refrigerant at any given temperature with reference to -40°F.

A thermodynamic variable that is a system's internal energy plus the product of its pressure and volume: H = E + PV. [Chemistry - The Molecular Nature of Matter and Change; Silberberg, Martin; Ed [..]

The heat content of a system.

(Heat Content) The sum of the internal and external energies.

For a given sample of air, a measure of the total heat content (the sum of the heat energy of the dry air and heat energy of the water vapor within it). It is typically used to determine the amount of fresh outside air that can be added to recirculated air for the lowest cooling cost.

Heat content; a thermodynamic property of a system defined as H = U + PV, where H is enthalpy, U is the internal energy of the system, P is the pressure exerted on the system by its environment, and V [..]

The heat content of a body or system, usually given by the formula H=U+pV ; where H is the hat content, U the internal energy , p the pressure and V the volume.

The total quantity of heat energy contained in a substance, also called total heat; the thermodynamic property of a substance defined as the sum of its internal energy plus the quantity Pv/J, where P [..]