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Viscosity

 Viscosity measurement:

 To test the viscosity of liquid using ford cup. Liquid has to filled in ford cup and time is measured when its flow through a standard orifices. All measurement using ford cups is done at room temperature i.e. 25 to 27 degree Celsius. 

The following formula is used to convert the time flow in second t, to kinetic viscosity V (cSt)

V1 = 0.49 (t − 35.0)

V2 = 1.44 (t − 18.0)

V3 = 2.31 (t − 6.58)

V4 = 3.85 (t − 4.49)                        


V5 = 12.1 (t − 2.00)

For example: 

  If you want to determine the viscosity of the oil fist we have to find the time in second. 

Want to know how to determine the time click on link.

Supposed time is 46 second the put it into given formula for 

V1= 0.49(46-35)

     = 5.39 cSt

Similarly for V2

V2 = 1.44 (46 − 18.0)

V2 = 40.32 cSt

For

V3 = 2.31 (46− 6.58)

      = 91.06 cSt

For

V4 = 3.85 (46 − 4.49)

151.767 cSt

And for 

V5 = 12.1 (46− 2.00)

      =532.4 cSt

Cup Care: 

nder each measurement clean the cup using proper suitable solvent and wipe using soft and clean cotton or tissue paper.


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