A tethered spinal cord is a disorder in which a child's spinal cord is pulled down and stuck, or fixed, to the spinal canal.The spinal cord normally floats free inside the spinal canal. As a child grows, the spinal cord must be able to move freely inside the spinal canal. tethered spinal cord is a disorder in which a child's spinal cord is pulled down and stuck, or fixed, to the spinal canal.
Surface Tension Surface tension is the skin-like surface of a liquid due to the cohesive forces between the liquid molecules. The diagram below shows an imagined magnified view of the surface of water, the molecules of liquid at the surface do not have other like- molecules above them.
Examples of surface tension. Walking on water: Small insects such as the water strider can walk on water because their weight is not enough to penetrate the surface. Floating a needle: A carefully placed small needle can be made to float on the surface of water even though it is several times as dense as water.