Abstract
The present study was designed to elucidate fundamental properties of mineral oils, which are discharged on the surface of the sea and which often give rise to serious damages to various kinds of marine life and fisheries. In the preliminary experiments, the thickness of the average monomolecular films of five kinds of crude oil was measured with a suspended plate-type surface balance. With this, the largest area that the film of a given quantity of oil discharged into the sea can cover was calculated. The resulting values were much larger than those of the oil films which had ever been known. Together with it, the average molecular weight of these kinds of crude oil was measured by the Rast's cryoscopic method.
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