List of publications on a keyword: «internal energy»


Publication date: 05.05.2016
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Gennadiy G. Haydarov , candidate of engineering sciences , associate professor
Andrey G. Haydarov , candidate of engineering sciences, associate professor , associate professor
St. Petersburg State Technological Institute (Technological University) , Санкт-Петербург г

«Interconnection between melting, boiling and critical points»

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We received theoretical formulas of the interconnection between melting, boiling and critical temperatures. Uniform physical representation of melting, boiling and evaporation processes was the basis for deriving the formula of interconnection between them. We use the concept of the material substance internal energy in terms of the molecules “unpacking” idea. The reference manual data on 85 substances from 13 to 855 degrees Kelvin confirms the theoretically derived formulas. We carried out the comparison of theoretical formulas and experimental data by their mean values. A simple ideal substance model with spherical molecules was considered as a model of substance molecule. The melting point is 1/3, and the boiling point ranges from 1/2 to 2/3 of the critical point for this model.