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The viscosity of a liquid is the resistance experienced by one portion of the liquid moving over another portion of the liquid. The absolute unit of viscosity in the cgs system is the poise which is expressed as dyne-seconds per square centimeter. Stokes are equal to poises divided by density. This method determines the viscosity in bubble seconds by timing or comparison. The bubble seconds are approximately equal to stokes for most liquids. This method is applicable to transparent liquids that are free from crystalline or gel particles.