What is difference between enthalpy and internal energy
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Enthalpy includes internal energy. Internal energy (U) is basically what it sounds like: How much energy a system has. This includes kinetic and potential energy and can be increased by heating or doing work on a system or exchanging mass.
Enthalpy (H) is the thermodynamic potential of a system and is the sum of internal energy and the product of pressure and volume of a system. This quote from Wikipedia sums it up nicely:
The U term can be interpreted as the energy required to create the system, and the pV term as the energy that would be required to "make room" for the system if the pressure of the environment remained constant. When a system, for example, nmoles of a gas of volume V at pressure p and temperature T, is created or brought to its present state from absolute zero, energy must be supplied equal to its internal energy U plus pV, where pV is the work done in pushing against the ambient (atmospheric) pressure.
Enthalpy (H) is the thermodynamic potential of a system and is the sum of internal energy and the product of pressure and volume of a system. This quote from Wikipedia sums it up nicely:
The U term can be interpreted as the energy required to create the system, and the pV term as the energy that would be required to "make room" for the system if the pressure of the environment remained constant. When a system, for example, nmoles of a gas of volume V at pressure p and temperature T, is created or brought to its present state from absolute zero, energy must be supplied equal to its internal energy U plus pV, where pV is the work done in pushing against the ambient (atmospheric) pressure.
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