Surface tension is the tendency for the surface of a liquid to act like a stretched membrane or piece of rubber. The cohesive forces work to bring the molecules on the interior of the liquid to the exterior surface. If you want to get scientific, surface tension is numerically equal to the force acting at right angles to a line of unit length that is lying on the surface and is called Constant of Capillarity and is represented by the symbol T. Capillarity is the interaction between contacting surfaces of a liquid and a solid that distorts the liquid surface from a planar, flat or two-dimensional, shape to concave or convex.
Cohesion is the attraction of molecules by which the elements of the body are held together. Water has the highest cohesive force of any liquid except that of mercury. At the air-water interface, the water molecules are H-bonded to one another and to the molecules below the surface. This makes the water behave as though it were coated with an invisible film.
Walking on Water
The main reason why certain creatures can “walk” on water and we can’t is because their bodies have tiny, little hairs on the bottom of their legs and feet. Their body weight is so minute that it only creates a dimple in the water’s surface which allows the insect to literally “walk on water.” Our body weight is too much for the cohesive forces of the water and we break through the invisible film that the tension creates.
Larvae live in diverse habitats, include fresh and salt water, soil, decaying material and as parasites of plants and animals. The lifespan of a larva varies according to the species. The larvae of monarch butterflies have lifespans of about two weeks, while other butterfly and moth species can live as a larva for a single week to as long as six weeks, in the case of the moth Actias luna.
These amazing photos show animals in a way that you’ve never seen them before. Each image serves as a reminder that we share the planet with some truly awe-inspiring creatures, created by Allah (God) May He be Glorified and Exalted.
A flood hits a fire ant colony in the Amazon jungle. An amazing chance to see footage on how the species has adapted to water to protect their queen.
WATCH: DOCUMENTARY ABOUT ANTS
Entomologist Dr George McGavin and leafcutter expert Prof Adam Hart will embark on an ambitious project, something that’s never been tried before. They will show us a hidden world. It has taken six months from planning to the final project. They’ve built a new home for one million of nature’s most extraordinary creatures – ants. They fascinate us, they build complex, organized societies and we’ve always drawn parallels between their world and ours.