s" = "1 cP"#.įor example, the viscosity of water at 20 ☌ is #"1.Many chemists still use an old unit of viscosity, the poise (P), named after the French physician Jean Poiseuille. Viscosity is measured using a viscometer. For instance, honeyhasa much higher viscosity than water. Itcorresponds roughly to the intuitive notion of a fluid's 'thickness'. s"^"-1"#, then the fluid has a viscosity #eta = "1 Pa Viscosityis a material property which describes the resistance of a fluid to shearing flows.If a fluid is placed between two #"1 m"^2# plates that are 1 m apart and one plate is pushed sideways with a force of 1 N and it moves at a velocity of #1color(white)(l) "m Thus, the units of viscosity are #("N" × color(red)(cancel(color(black)("m"))))/("m"^2 × color(red)(cancel(color(black)("m"))) in a pipe having a diameter 5cm given that coeficient of visocity of water is 103Pa sec. Temperature dependency of complex viscosity of honey samples was modeled by Arrhenius model and activation energy values of honeys ranged from 83.13 to 97. In terms of the above diagram, the formula for viscosity #eta# is The coefficient of viscosity of water is less than honey. Pine honey showed the highest complex viscosity (86.33 Pa s at 10☌), while the lowest complex viscosity was observed in citrus honey (22.15 Pa s) at the same temperature. One way to measure viscosity is to place the fluid between two flat parallel plates and slide one plate past the other. We usually think of the viscosity of a liquid as its "thickness".įor example, we say that honey is "thicker" (has a higher viscosity) than water. The viscosity of a fluid is a measure of its resistance to flow.
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