Calculating The Collision Diameter And Viscosity Of A Gas

2067 Words Feb 8th, 2016 9 Pages
Calculating the Collision Diameter and Viscosity of a Gas by
Measuring Pressure Over Time as the Gas is Evacuated from a Cell
Michelle Plavnik
Department of Chemistry, Emory University, Atlanta, GA, 30322, United States

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ABSTRACT: The aim of this experiment was calculating the values of viscosity and collision diameter for nitrogen gas, argon gas, and dry air. This objective was carried out by filling a glass bulb to a pressure of about 700 Torr with the desired gas and letting it evacuate the bulb through a capillary over a ten minute period. The pressure was recorded every five seconds. The inverse pressure was graphed against time, and a linear regression along with a least squares were performed. The slope of the line of best fit was used to calculate the capillary radius, which was then used to calculate the viscosities of the gases, which were used to calculate the collision diameters. The experimental values were compared to the literature values by percent difference, and it was found that this technique is not effective. Percent errors ranged from 0% to 30%. To make the values more accurate, the assumptions made in calculations need to be the same for all values. To take the experiment further it could be performed at other pressures, temperatures, and on other gases. Understanding properties like collision diameter and viscosity of gases are important in fields such as gas phase reaction dynamics.

Introduction Gas phase reaction dynamics is an…

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