FR expt 4 viscosity - Mapa Institute of Technology 70L A31...

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170L – A31 o: 2011 yahoo.com capillary-flow, Ostwald viscometer, temperature, salt concentration Mapúa Institute of Technology School of Chemical Engineering, Chemistry, Biological Engineering and Materials Science Engineering Measurement of Viscosity of Liquids by  Capillary flow Method Austria, Meynard 1 Baniqued, Paul Dominick E. 2 1 Professor, School of Chemical Engineering, Chemistry, Biological Engineering and Materials Science Engineering, Mapua Institute of Technology; 2 Student, CHM170/A31 Molecular Biology and Biotechnology Laboratory 2, Biological Engineering and Chemistry, Mapua Institute of Technology ABSTRACT Viscosity is calculated in this experiment by a method known as the Capillary-flow method. The instrument used is the Ostwald Viscometer. The liquid sample is passed by the two calibration marks in the feed bulb of the instrument and the time for it to pass back is recorded. Viscosity is then calculated by using the equation that relates it from density, the time and the proportionality constant A which is certain for every viscometer to be used. The viscosity of pure liquids varies for each sample: ethylene glycol had the highest viscosity while water samples have the lowest in a set of given compounds. The solute concentration in salt solution affects the viscosity in a directly proportional manner. The temperature also affects the viscosity but in an inversely proportional manner. INTRODUCTION Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or tensional stress. Viscosity describes a fluid's internal resistance to flow and may be thought of as a measure of fluid friction. The viscosity of a liquid is related with which the molecules can move with respect to one another. Thus the viscosity of a liquid depends on the: strength of attractive forces between
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This note was uploaded on 04/27/2011 for the course CHM 170 taught by Professor Ng during the Spring '11 term at Mapúa Institute of Technology.

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FR expt 4 viscosity - Mapa Institute of Technology 70L A31...

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