Significance of relative viscosity at different temperature

The significance of relative viscosity at a different temperature is-

  • The relative viscosity of lubricants increases with a decrease in temperature.
  • This leads to poor lubricating property due to thickening of lubricant film which reduces moving to slide motions of the machine part.
  • It decreases with increase in temperature in temperature this leads to poor lubricating property due to the breaking of lubricant film leading to wear and tear of the machine.
  • The lubricant which shows slight changes in relative viscosity with respect to temperature changes is a good lubricant.

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