![]() This thermodynamic property is often expressed in the units of: ENTHALPY ( H)Įnthalpy is expressed as the summation of the internal energy and the product of both the pressure ( P) and volume ( V). And here is the formula for calculating the internal energy ( U) and as for me, I use a mnemonic in remembering easily the formula in finding the internal energy and that is with the initials UV wherein I always say it as “University of Visayas” which is one of the universities here in Cebu, there are many ways of mastering it and making mnemonics, and the one I told is my own way of remembering the formula. Internal energy is often calculated as a function of the specific heat capacity at constant volume and the temperature change being experience by the substance. ![]() Internal energy ( U) is the total energy in a system which includes both the potential and kinetic energy and is associated with the random and disordered motions of the molecules. For example, air it has k = 1.3 for hot-standard and k = 1.4 for cold-standard, respectively. We must always take note that the value of the adiabatic index ( k) must always be greater than one. So here are the relations for the specific heat capacity at constant volume ( C v) and at constant pressure ( C p). Furthermore, the specific heat capacity at constant volume ( C v) and specific heat capacity at constant pressure ( C p) are in close relation wherein it takes into account the gas constant ( R) and the adiabatic index ( k) of a certain ideal gas. ![]() Take note that 1 British Thermal Unit (BTU) is equal to 778 ft-lb f.Īctually there are two specific heat capacities one wherein it is at constant volume ( C v) and whereas the other one is at constant pressure ( C p). Specific heat capacity of a substance like gases is expressed in units of: The specific heat or usually known as specific heat capacity of the substance is the amount of heat that is required to change the temperature of unit mass of one degree. So without further ado, I will now start my discussion regarding these four parameters. Today allow me to continue sharing about the Ideal Gases wherein I will elaborate the other important parameters wherein gases are taken into account and these are as follows:
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