Chapter 20
The First Law of Thermodynamics
A thermodynamic system is a set of objects whose thermodynamic properties are of interest. The system is considered to be embedded in its…
In mechanics, work is done on an object when the force acting on it displaces the object. In thermodynamics, work done on a system can be estimated…
The work done by a thermodynamic system depends not only on the initial and final states but also on the intermediate states—that is, on the…
The internal energy of a thermodynamic system is the sum of the kinetic and potential energies of all the molecules or entities in the system. The…
The first law of thermodynamics states that the change in internal energy of the system is equal to the net heat transfer into the system minus the…
A thermodynamic system with zero heat exchange and work is an isolated system. For these systems, the internal energy remains constant.
In the case…
A thermodynamic process that occurs at constant volume is called an isochoric process. According to the first law of thermodynamics, heat supplied or…
Heat capacity is the ratio of heat absorbed by the substance corresponding to its temperature change. It is also called thermal capacity and the SI…
The number of independent ways a gas molecule can move along straight line, rotate, and vibrate is called its degrees of freedom. Supposing d…
When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic…
Consider the adiabatic compression of an ideal gas in the cylinder of an automobile diesel engine. The gasoline vapor is injected into the cylinder…
Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four…
Photothermal beam deflection together with photo-acoustic calorimetry and thermal grating belongs to the family of photothermal methods that monitor…
Differential Scanning Calorimetry — A Method for Assessing the Thermal Stability and Conformation of Protein Antigen
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Differential scanning calorimetry (DSC) is an analytical technique that measures the molar heat capacity of samples as a function of temperature. In…