Abstract
A method is proposed for measuring either the solid-liquid contact angle or the liquid surface tension. The method depends on the break-down of the liquid meniscus formed under an inclined test plate fixed on an inclined surface of a support block. The plate and the support block are once immersed into a liquid bath and then lifted up gradually, thus making the meniscus slide downward on the inclined plate. When the constricted portion of the meniscus makes contact with the side wall of the support block, the meniscus immediately breaks, causing a spontaneous falling down of the liquid along the side wall. The contact angle θ can be calculated theoretically from the measured critical height HBcr of the upper edge of the support block at the moment of the meniscus break. The liquid surface tension σ also can be determined by the same principle with the aid of a glass plate which is wetted by the liquid zero contact angle. The feasibility and the usefulness of the method were experimentally examined.
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