energy equation
91Rankine–Hugoniot equation — The Rankine–Hugoniot equation governs the behaviour of shock waves normal to the oncoming flow. It is named after physicists William John Macquorn Rankine and Pierre Henri Hugoniot, French engineer, 1851 1887.The idea is to consider one… …
92Differential algebraic equation — In mathematics, differential algebraic equations (DAEs) are a general form of (systems of) differential equations for vector–valued functions x in one independent variable t, where is a vector of dependent variables and the system has as many… …
93Saha ionization equation — The Saha ionization equation, also known as the Saha Langmuir equation, was developed by the Indian astrophysicist Megh Nad Saha in 1920, and later (1923) by Irving Langmuir. One of the important applications of the equation was in explaining the …
94Kapustinskii equation — The Kapustinskii equation calculates the Lattice Energy UL for an ionic crystal, which is experimentally difficult to determine. It is named after Anatoli Kapustinskii who published the formula in 1956.:U {L} = 1202.5 cdot frac{ u cdot |z^+| cdot …
95Born-Landé equation — The Born Landé equation is a means of calculating the lattice energy of a crystalline ionic compound. In 1918 [ I.D. Brown, The chemical Bond in Inorganic Chemistry , IUCr monographs in crystallography, Oxford University Press, 2002, ISBN… …
96Principle of minimum energy — The principle of minimum energy is essentially a restatement of the second law of thermodynamics. It states that for a closed system, with constant external parameters and entropy, the internal energy will decrease and approach a minimum value at …
97Hammett equation — ; 1935; 17(1); 125 136 [http://pubs.acs.org/cgi bin/abstract.cgi/chreay/1935/17/i01/f pdf/f cr60056a010.pdf Abstract] ] .The basic idea is that for any two reactions with two aromatic reactants only differing in the type of substituent the change …
98Entropy (energy dispersal) — The thermodynamic concept of entropy can be described qualitatively as a measure of energy dispersal (energy distribution) at a specific temperature. Changes in entropy can be quantitatively related to the distribution or the spreading out of the …
99Vacuum energy — is an underlying background energy that exists in space even when devoid of matter (known as free space). The vacuum energy is deduced from the concept of virtual particles, which is itself derived from the energy time uncertainty principle. Its… …
100Internal energy — In thermodynamics, the internal energy of a thermodynamic system, or a body with well defined boundaries, denoted by U , or sometimes E , is the total of the kinetic energy due to the motion of molecules (translational, rotational, vibrational)… …
