Surfactant! or 'Pulmonary Surfactant' Just had one of those moments too :)
A substance that tends to reduce the surface tension of a liquid in which it is dissolved.
surfactant
These substances are called surfactants.
surfactants
Surfactant is a substance which lines the inside of alveoli. It is composed of a phospholipid bilayer, which have hydrophyllic and hydrophobic properties. This allows it to reduce surface tension.
surfactant
A surfactant is a substance that, when mixed with a liquid, reduces its surface tension. There are usually two or more surfactants in a bar of soap.
Soap will lower the surface tension of water. Like any surfactant soap will lower the surface energy by disrupting the strong inter-molecular hydrogen bonding that confers such a strong surface tension to water.
The highest surface tension at 15 0C is the surface tension of mercury: 487 dyn/cm.
Because of surface tension
The surface tension of water is due to the hydrogen bonds contained in it.When sugar is added to it,the dissolution process occurs which leads to the breaking of the hydrogen bonds in water by the hydration energy generated by the interaction of sugar and water.Therefore sugar reduces the surface tension in water
Humans benefit greatly from the work of Pulmonary surfactant which reduces the surface tension in the alveoli of the lungs. This reduction in alveolar surface tension prevents the alveoli from collapsing and thus causing suffocation.