1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Viscosity 5W-30 oil

  1. Sep 15, 2007 #1
    Hi guys,

    For a prac we did, we are given the properties of a particular oil.

    Density (kg/m^3) = 876

    Viscosity (Ns/m^2) = 20.0x10^(-3)

    I believe it is the dynamic viscosity. Now is this viscosity correct? Or should it be 2.0x10^(-3)
  2. jcsd
  3. Sep 16, 2007 #2


    User Avatar

    Staff: Mentor

  4. Sep 16, 2007 #3


    User Avatar
    Science Advisor
    Homework Helper

    Kinematic viscosity 10.3 cSt = 10.3 E-6 m^2/s
    To convert to kinematic to dynamic viscosity, multiply by the density,
    Dynamic viscosity = 10.3 E-6 * 876 = 9.02 E-3 Ns/m^2 = 9.02E-3 Pa-s

    If the dynamic viscosity is 45E-3 Pa-s at 40C and 9E-3 Pa-s at 100C,
    the correct value for your experiment could be either 20E-3 or 200E-3 depending on the temperature.
    Last edited: Sep 16, 2007
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?