Describe the following: (i) Internal Energy (ii) Enthalpy (iii) Heat Capacity
Answers
(i) Internal energy is NOT all the energy in the system, it is the kinetic and potential energy associated with the random motion of the molecules of an object. If you heat an object, you will increase its internal energy. As the object cools, its internal energy will decrease.
(ii) Enthalpy is a concept used in science and engineering when heat and work need to be calculated. ... When a substance changes at constant pressure, enthalpy tells how much heat and work was added or removed from the substance. Enthalpy is similar to energy, but not the same.
(iii) Heat capacity means the amount of heat that a piece of HVAC equipment can provide. When you see the term 'heat load,' it is referring to the building's needs. When you see the term 'heating capacity,' it refers to the actual heating equipment.
Answer:
1. Internal energy : "the energy in a system arising from the relative positions and interactions of its parts "
2.Enthalpy:"a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume."
3.Heat capacity : "Heat capacity is defined as the amount of heat required to raise the temperature of a mass of substance by 1°C."
Explanation:
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