โ Scribed by H.C. Rogers
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T, is the temperature at which the surface tension is measured.
The density p must also be corrected, using the bulk coeilicient of expansion.
Using a factor o = 9 and without making any temperature corrections, relatively good predictions are made for the surface tension of many metals.
Table 1 shows some of the comparative data. TABLE 1. Surface tension of liquid metals'6V7) Metal*
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The temperature dependence of the yield stress in iron\* Erickson and Lo@' have recently suggested that the observed fattening of the yield-stress vs. temperature curve for iron at low temperatures may be due to the occmrence of tying rather than to the effect of s&mq&ere dew&y which is taken into
EDITOR 415 ruptly at the beads and would fracture there at somewhat lower stresses than those needed to break the whisker near its center. The maximum fracture stress found so far for silicon was 390 kg/mm2, which is 2.03% of the Young's Modulus for the (111) direction5 (19.22X103 kg/mm2).t6 This