Experiment 9

Experiment 9 - Luke Wyatt Experiment 9 Experiment 9...

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Luke Wyatt Experiment 9 18/10/06 Experiment 9: Measurement of Viscosity by Stokes’ Law Risk Assessment The Experiment had a very low risk. These are outlined below. 1. Chemical – Toxic 2. Mechanical Experiment Aim The aim of the experiment was to measure the time it takes for various ball- bearings of various diameter to fall through glycerine, and use the results to calculate the velocity of each ball-bearing and use this to calculate the viscosity of glycerine. Apparatus & Diagram Below is a list of all the apparatus which was used in the experiment Measuring cylinder Glycerine Stop-watch Various sized steel ball-bearings Meter rule Micrometer Thermometer Below is a diagram of how the apparatus was set up in order to collect the results. 1of 4

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Luke Wyatt Experiment 9 18/10/06 Theory The terminal velocity v is such that the apparent weight 4/3 π a³(ρ-σ)g is equal to the viscous drag 6 π ηav. Thus the viscosity η is given by: η = 2/9g(ρ-σ)a²/v = 2/9g(ρ-σ)x(c/d) In SI units, g=9.81m/s ֿ
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