When the dynamic contact angle values or parameters of a Washburn test need to be determined, it is necessary to know the density of the test liquids. If that is unknown, then by using the density Kit, which consists of a solid probe of known density, the DCA will perform an automatic procedure to obtain the liquid density.
The Archimedes principle is used to determine the liquid density, wherein a solid of known weight and density (to obtain volume in air) is immersed in the unknown liquid and weighed. The Buoyancy force on the solid is calculated.
Therefore, the final equation for the calculation of liquid density (in g/cm3) is:
Liquid Density = Solid Density x Buoyancy Force / Solid Weight in Air
Click here to access the DST series of analysers which offer density measurement analysis.
Contact us for additional information on measurements and modalities for different surface chemistry analyses.
