Enthalpy (ΔH) Explained - the total heat content of a System

Enthalpy is a thermodynamic property of a system that represents the total heat content of that system. It is often denoted by the symbol "H" and is expressed in units of energy, such as joules (J) or calories (cal). Enthalpy takes into account both the internal energy of a system and the work done by or on the system due to changes in pressure and volume.
Enthalpy is particularly useful in the study of chemical reactions and physical processes, especially those that occur at constant pressure. The change in enthalpy during a process denoted as ΔH (delta H), is related to the heat exchange between the system and its surroundings. It is given by the equation:
ΔH = Q + PΔV
Where:
ΔH is the change in enthalpy (in J or cal).
Q is the heat transferred to or from the system during the process (in J or cal).
P is the pressure of the system (in pascals or atmospheres).
ΔV is the change in volume of the system (in cubic meters or liters).
The term Q represents the heat added to the system if it is positive (endothermic process) or the heat released by the system if it is negative (exothermic process). The term PΔV represents the work done on or by the system due to changes in pressure and volume.
Enthalpy is a valuable concept in chemistry because it allows chemists to measure and predict the heat changes that occur during chemical reactions. For example, in a chemical reaction that occurs at constant pressure, the change in enthalpy (ΔH) is equal to the heat exchanged between the reactants and the surroundings. This relationship is described by the principle of constant-pressure calorimetry and is commonly used to determine the heat of reaction or enthalpy change of a chemical reaction.
Enthalpy is also used in other fields of science and engineering, such as thermodynamics, to analyze and understand energy changes in various processes, including phase transitions, heat transfer, and more. It provides a convenient way to quantify the energy content and energy flow within a system.
00:00 Introduction
01:23 Enthalpy
03:34 Questions

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