Search results
Results from the WOW.Com Content Network
As a quantitative variable analogous to thermodynamic temperature, transformity requires specification of units." (1987, p. 261. My emphasis). In 1996 H.T.Odum defined transformity as, "the emergy of one type required to make a unit of energy of another type. For example, since 3 coal emjoules (cej) of coal and 1 cej of services are required to ...
Biswa Ranjan Nag (1 October 1932 – 6 April 2004) was an Indian physicist and the Sisir Kumar Mitra chair professor at Rajabazar Science College, University of Calcutta. Known for his research in semiconductor physics , Nag was an elected fellow of the Indian National Science Academy and Indian Academy of Sciences .
Download as PDF; Printable version; In other projects Wikimedia Commons; Wikiversity; ... Chemical engineering thermodynamics (11 P) Cooling technology (13 C, 158 P)
Altitude (or elevation) is usually not a thermodynamic property. Altitude can help specify the location of a system, but that does not describe the state of the system. An exception would be if the effect of gravity need to be considered in order to describe a state, in which case altitude could indeed be a thermodynamic property.
The first and second law of thermodynamics are the most fundamental equations of thermodynamics. They may be combined into what is known as fundamental thermodynamic relation which describes all of the changes of thermodynamic state functions of a system of uniform temperature and pressure.
The first law of thermodynamics is essentially a definition of heat, i.e. heat is the change in the internal energy of a system that is not caused by a change of the external parameters of the system. However, the second law of thermodynamics is not a defining relation for the entropy.
A thermodynamic system is a macroscopic object, the microscopic details of which are not explicitly considered in its thermodynamic description. The number of state variables required to specify the thermodynamic state depends on the system, and is not always known in advance of experiment; it is usually found from experimental evidence.
The discontinuity in , and other properties, e.g. internal energy, , and entropy,, of the substance, is called a first order phase transition. [12] [13] In order to specify the unique experimentally observed pressure, (), at which it occurs another thermodynamic condition is required, for from Fig.1 it could clearly occur for any pressure in the range .