#### Question

Calculate the density of paraffin oil, if glass capillary of diameter 0.25 mm dipped in paraffin oil of surface tension 0.0245 N/m rises to a height of 4 cm. (Angle of contact of paraffin with glass = 28^{°} and acceleration due to gravity = 9.8 m/s^{2}.)

#### Solution

Given `r=0.25/2=0.125mm`

=0.12510^{-3}m

T = 0.0245N /m

h=4x10^{-2}m

θ=28^{º, }g=9.8

`T=(hrrhog)/(2costheta)`

`rho=(2Tcostheta)/(hrg)`

`=(2xx0.0245cos28^@)/(0.125xx10^(-3)xx4xx10^(-2)xx9.8)`

=882.9kg/m^{3}

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#### APPEARS IN

Solution Calculate the Density of Paraffin Oil Concept: Capillarity and Capillary Action.