Abstract
The surface tension between silicate liquid and gas has been measured for four lava compositions (limburgite to andesite) from 1,200° to 1,500° C. The magnitude of surface tension (γ) is in the range 350–370 dynes/cm. Variations found in γ as a function of liquid composition were small and had no obvious relation to liquid composition. γ was also found to vary little with furnace atmosphere — air, Ar, CO2, H2, CO and their mixtures. A relaxation time of hours to days, depending on temperature, is required before reproducible results can be obtained from originally crystalline starting material.
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