(a) Derive an expression for the change in capillary height (h) in the circular tube of a liquid with surface tension (os) and contact angle (0), as in Figure 1. (b) Discuss on the capillary height (h) with the tube radius (R), (c) Explain the condition when contact angle is less then 90° (wetting liquid) and more then 90° (capillary depression) according to the capillary height (h).

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Strain energy

The term strain indicates the variation in an object's length, area, and volume when the object is subjected to an external force. The external force may be of normal, shear, moment, torque, etc. The strain in an object depends on the types of external force and cross-section of the object. Mathematically, the evaluation of strain can be obtained with the help of elastic constants.