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What is the difference between enthalpy, entropy and energy?

Enthalpy may be defined as the energy supplied or take out from the system at constant pressure. It is denoted by H. It is mathematically defined as sum of internal energy and Pressure-Volume work.

  ΔH = ΔU  +  PΔV

Entropy may be defined as the measurement of randomness of system particles. It is denoted by S. For a reversible reaction

  ΔS =  

 

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Enthalpy can be considered as total energy contained. Enthalpy is denoted by 'h' (specific enthalpy)

Enthalpy = internal energy 'u' + pv where p and v are the pressure and volume. product pv can be considered as the flow work in a gas system.
Enthalpy can be considered as an arbitrary concept.

Entropy is generally defined as ds = dQ/T where ds is the entropy, dQ is the heat addition per degree of temperature (T = Temperature in Kelvin)

Entropy is also defined as disorder in this universe. Entropy in this universe always increases and it can never decrease. In any thermodynamic process entropy change is always greater than or equal to zero.

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