Sentence:  If it is assumed that the formula given by Lodge of * * f , cosec 2lc applies , the <WSD>pressure</WSD> difference along the major axes can be calculated from the angle of inclination of the major axis , and from this the interfacial tension can be calculated . 
Meaning of the word marked with <WSD> tags:  the force applied to a unit area of surface; measured in pascals (SI unit) or in dynes (cgs unit)