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. 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. We found that the sickest patients with Covid-19 had the highest PV levels, more than twice normal levels, says Maier. Rubbing alcohol molecules (2-propanol) are significantly larger than those of water, so their greater London forces result in a higher viscosity. Hyperviscosity syndrome, where the high viscosity leads to dangerous sludging of the blood in the brain and other organs, produces viscosity levels similar to those seen in the sickest Covid-19 patients. 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. 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.
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