![]() ![]() It can be computed with the following formula: Viscosity ( force distance. ![]() The molecules in vegetable oil form no hydrogen bonds, but their large size means that the London forces are very strong and the liquid is extremely viscous. How do you calculate viscosity Viscosity is the ratio of the shear stress to the velocity of the gradient. Rubbing alcohol and ethylene glycol (HOCH 2CH 2OH) molecules will have similar London forces, but with two hydroxyl groups, ethylene glycol molecules form twice as many hydrogen bonds as those of 2-propanol, so ethylene glycol is more viscous. Rubbing alcohol molecules (2-propanol) are significantly larger than those of water, so their greater London forces result in a higher viscosity. Each of the first three substances can form hydrogen-bonds. The rate of flow of a liquid depends on the magnitude of the intermolecular forces and the shapes of the molecules. Note: The viscosity of the liquids, not the pipets, is being tested. The narrow point in the pipet is responsible for restriction of liquid flow. Intertek viscosity tests measures fluid flow properties, and are useful for product evaluation, research and quality control. Both samples given on the VISCOSITY COMPARATOR side by. The associated still images include pictures of the apparatus, labeled samples (from left to right: water, rubbing alcohol, ethylene glycol, vegetable oil), and the tip of pipet. To test the viscosity the sample of the used oil cools down to the temperature of the fresh oil sample. ![]()
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