enthalpia

Enthalpy is a thermodynamic property that represents the total heat content of a system. It is defined as the sum of the internal energy of the system and the product of its pressure and volume. Enthalpy is denoted by the symbol H and is measured in units of energy, such as joules or kilojoules. The change in enthalpy (ΔH) is a crucial concept in thermodynamics, representing the heat exchanged between a system and its surroundings at constant pressure. Enthalpy changes are often used to describe the energy changes in chemical reactions, phase transitions, and other physical processes. The enthalpy of a system can be positive or negative, depending on whether heat is absorbed or released during a process. Enthalpy is an extensive property, meaning its value depends on the amount of substance present. It is widely used in various fields, including chemistry, physics, and engineering, to analyze and predict the behavior of systems under different conditions.