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Interfacial area in liquid‐liquid systems has been measured photographically. Precision and accuracy of the method have been shown to be better than 10%. To avoid tedium of counting drops, a simple light probe of easily reproducible design has been developed to measure the light transmission through the dispersions formed. A correlation of light transmittance with interfacial area is presented and its usefulness and limitations are discussed.

This rep ort was prep ared as an acc oun t of Gov ernr ent Bpo nso red wor k. Neit her the Unit ed f Stat es, nor the Com miss ion, nor any perso n ac Ung o beha lf of the Com miss ion:

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