- #1
vmc303
- 7
- 0
Could someone give me a concise explanation of the difference between the two? I'm struggling to understand which concept to apply in a given situation, and what they actually signify.
Enthalpy describes a state of energy of a gas - essentially the heat energy and pressure energy content of a gas: H = U + PV. A change in enthalpy denotes a change in energy content of the gas, ie. some combination of change in temperature, pressure and/or volume of the gas.vmc303 said:Could someone give me a concise explanation of the difference between the two? I'm struggling to understand which concept to apply in a given situation, and what they actually signify.
Soumen2010 said:Difference between Enthalpy and Internal energy:
Enthalpy is “Entire thermal and pressure occupancy energy”.
Energy is the ability to do work or cause change. It is a scalar quantity that is measured in units such as joules (J) or calories (cal).
Enthalpy is a measure of the total energy of a thermodynamic system. It includes both the internal energy of the system and the work required to create or change the system's pressure and volume. It is also a scalar quantity and is measured in the same units as energy.
Energy and enthalpy are closely related, as enthalpy is a measure of the total energy of a system. However, they are not the same thing. Enthalpy includes not only the internal energy of a system, but also the work required to change the system's pressure and volume. This means that for a closed system, the change in enthalpy is equal to the heat added or removed from the system, plus any work done on or by the system.
No, energy and enthalpy are not interchangeable. They are different forms of energy and represent different aspects of a system. However, a change in enthalpy can be related to a change in energy through the use of the first law of thermodynamics, which states that energy cannot be created or destroyed, only transferred or converted.
Energy and enthalpy have many real-world applications, particularly in the fields of chemistry, physics, and engineering. For example, the study of enthalpy changes is important in chemical reactions, as it helps to determine the energy released or absorbed by a reaction. In power plants, energy and enthalpy are used to calculate the efficiency of energy conversion processes. In everyday life, energy and enthalpy are important in understanding and controlling the behavior of various systems, such as heating and cooling systems, engines, and refrigerators.