![]() ![]() The ball bearing was attached to the end of a straw to make it easier to time more accurately the exact moment at which the ball bearing had fallen 10cm. Viscosity index indicates the change in fluid viscosity in dependence of temperature. ![]() Q: What is viscosity index A: Viscosity index of a fluid is a calculated number according to ASTM D2270 or ISO 2909. Repeat readings were taken of each temperature of honey to try and ensure no anomalies. For example the viscosity of honey is higher than the water. Preliminary A ball bearing was dropped into honey of four different temperatures, being cleaned and dried between each, the time taken for the ball to fall 10cm was recorded. The diameter of the ball bearing is 10.00mm correct to one hundredth of a millimetre and so the radius, r, is 5mm. When we measured the ball bearing, the markings on the barrel showed the diameter to be 10mm and the thimble at 0. The barrel also has evenly spaced markings each representing 1mm. There are 50 evenly spaced markings around the thimble each representing 0. The ball bearing was inserted into the gap between the anvil and the spindle and the thimble was slowly turned. I used a micrometer screw gauge to measure the diameter of the ball bearing accurately. ![]()
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