1 at 60degc the surface tension of water is 00662 nm and, Ask an Expert

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1. At 60°C the surface tension of water is 0.0662 N/m and that of mercury is 0.47 N/m. Determine the capillary height changes in these two fluids when they are in contact with air in a glass tube of diameter 0.55 mm. Contact angles are 0° for water and 130° for mercury.

2. Determine the diameter of the glass tube necessary to keep the capillary-height change of water at 30°C less than 1 mm.

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