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Advancing contact angles are reported for the water-PTFE, water-copper, water-stainless steel, water-PMMA and n-decane-PTFE systems for a range of liquid drop sizes.The angles were determined at 25 ~ in an air or nitrogen-saturated atmosphere and compared with those measured at the boiling point in an environment only of its vapor.For water-PTFE and water-PMMA systems, a decrease in contact angle with decreasing drop size was observed in an air-saturated environment at 25 ~ confirming the data of Good and Koo. An increase in contact angle however occurred with decreasing drop size at the boiling point in the pure vapor atmosphere confirming the results of Boyes and Ponter. The introduction of nitrogen decreased the contact angle although the trend remained the same.

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