Measurement of Surface Tension By Capillary Rise Method - Edubirdie

University:
North Idaho College
Course:
PHYS-211 | Engineering Physics I
Academic year:

2023
Views:

163

Pages:

4
Author:

Hani T.

BY capillary Rise Method If a glass capillary tube is placed in Liquid. the liquid usually rises in the capillary if it wets the glass. That is, the Contact angle is Less than 90°. let the radius of the tube be r, and let height to which the liquid rises be h. Force due to Surface Tension Causing the rise is F = Y cosθ x 2πr Figure: Measurement of Surface Tension by capillary rise method. where θ is the contact angle and Y is the surface Tension. Downward force of liquid due to gravity is vdg. where v is the volume, d is the density Where h is the height in the capillary tube d is the density, r is the radius and g is the gravitational constant. ( l and h are in cm or m, d is in g/cm³, and Y has units of kg/s² or N/m

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