Surface tension
The expression of intermolecular attraction at the surface of a liquid, in contact with air or another gas, a solid, or another immiscible liquid, tending to pull the molecules of the liquid inward from the surface; dimensional formula: mt-2.
A still body of water may be disturbed by a variety of factors. One of them is wind. In fact, it is considered as the prime factor responsible for water disturbance. Such disturbance can affect the distribution of organisms in the habitat. This tutorial looks at how these abiotic factors affect the way in which organisms operate in the freshwater ecosystem...
The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides details of the different parts and functions of the respiratory system...