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The surface tensions of liquid gold and of a gold-copper alloy were measured on electromagnetically levitated drops as a function of temperature in ground-based and in microgravity experiments. In terrestrial experiments, strong electromagnetic fields are necessary to compensate the earth's gravity. Their influence on the drop cannot be neglected, and a correction formula is applied to obtain the true surface tension. In microgravity, the positioning forces are negligible. Comparison of the corrected ground-based results with our microgravity data yield excellent agreement.
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Egry et al. (1995) studied this question.
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