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Vapour Pressure

The following...

Question

The following is a method to determine the surface tension of liquids.

single capillary method

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refractometric method

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polarimetric method

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boiling point method

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Solution

The correct option is A single capillary method
When a liquid rises in a capillary tube, the weight of the column of the liquid of density ρ inside the tube is supported by the upward force of surface tension acting around the circumference of the points of contact. This method is called single capillary method.

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T

D = 1.25 \times 10^{- 2} m

h = 1.45 \times 10^{- 2} m

g = 9.80 m / s^{2}

T = \frac{r h g}{2} \times 10^{3} N / m

T

D = 1.25 \times 10^{2} m

h = 1.45 \times 10^{2} m

g = 9.80 m s^{- 2}

T = (\frac{r h g}{2}) \times 10^{3} N / m,

T

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