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It should be noted that in recent years, solutions with liquid components have a very wide distribution in the art and are used in many industrial processes, heat exchanging devices. They are also used as the working fluid, fuels, oxidizers, reducing agents, protective devices, cooling and heating media, solvents, propellants, surfactants and other functional substances and materials used in all industries. Therefore, we experimentally investigated the density of sunflower oil depending on the concentration of n-hexane in the temperature range from 293-539,2 and To a pressure 0,101-9.81 MPa. To measure the density of solutions of the sunflower oil + n-hexane used method of hydrostatic weighing and thermal conductivity by a cylindrical bikalorimetr regular thermal regime.

The purpose of this research is to establish the relation between variability of physical and chemical properties of oil and geodynamic activity of the oil fields of the Republic of Tatarstan on the basis of generalization, systematization and analysis of information on physical properties of oil collected during the period from 1956 to 2004. It has been experimentally established that oil extracted from reservoirs located within zones with low geodynamic activity differs a lot by its mean density from the oil related to geodynamically active areas. The results of the study show the significant role of processes of destruction and re-formation of oil deposits of the Tatar Arc and surrounding areas during the last neotectonic phase.

No presente trabalho, faz-se uma análise metrológica das incertezas associadas às medições da densidade de óleo de cozinha por dois métodos distintos, a saber, o de medição direta (razão massa-volume) e o método de tubo em U. A idéia é ajudar o professor na montagem de experimentos de baixo custo. Em relação ao método de medição utilizando um tubo em U, melhorias são propostas com a substituição do tubo de vidro por um tubo transparente flexível e de baixo custo. Os autores definem o fator de vantagem de um experimento, Fv, como sendo o produto da incerteza da grandeza física (δ) pelo seu custo (C), que pode ser utilizado como um critério para decidir o impasse entre a qualidade dos resultados obtidos e o custo de um determinado experimento. In this work one does a metrological analysis of the associated uncertainties to the kitchen oil density measurements using two different methods: the direct measurement (ratio mass-volume) and U tube method. The idea is to help the teacher in the setup of low cost experiments. About the measurement using the U tube method, improvements are proposed substituting the U glass tube for a low cost transparent flexible tube. The authors define the profit factor of an experiment, Fv, as being the product of the uncertainty in the physical quantity (δ) by its cost (C). The profit factor can be used as a criterion to decide between the quality of the obtained results and the cost of an experiment.