Richard J. Szabo. 's Busstepp Lectures on String Theory PDF

By Richard J. Szabo.

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In measuring surface tension it is important that the liquid surface be scrupulously clean. The thinnest layer of oil on the surface of water considerably reduces its surface tension, as may also any dissolved impurity. Values of y for various liquids appear in Table 1. ) EXAMPLE If the reading of the balance shown in Fig. C. COURSES 28 pan, calculate the surface tension of the soap solution if the length 1 of the frame is 10 cm. Neglect the weight of the film. 1 N. 81)/103 N. 45 C 10-2 N m-1.

The following considerations will help to make this clear. Suppose an ungraduated alcohol thermometer and a mercury thermometer, graduated in the manner previously described, are both put into a bath of melting ice which is then gradually heated to the boiling point. The alcohol thermometer could then be calibrated in degC by reference to the readings on the mercury thermometer. The alcohol thermometer would thus have been calibrated to read mercury-in-glass temperatures. There is no reason at all why one should expect the markings on the alcohol instrument to be equally spaced simply because they are on the mercury instrument.

5. Rise of Liquids in Capillary Tubes The surface of a liquid in the bore of a capillary tube, held vertically with its lower end dipping into a reservoir of the liquid, may be considered as spherical, or almost so, assuming FIG. 8. the bore to be of circular cross-section. If the radius of the spherical liquid surface is r then, referring to Fig. 8 it is clear that R = r cos a, where R = radius of capillary bore 33 SURFACE TENSION and a is the angle of contact. Clearly, if a = O (as for clean, pure water and clean glass), then R = r.

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Busstepp Lectures on String Theory by Richard J. Szabo.

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