The surface tension of a liquid results from an imbalance of intermolecular attractive forces, the cohesive forces between molecules: A molecule in the bulk liquid experiences cohesive forces with other molecules in all directions. A molecule at the surface of a liquid experiences only net inward cohesive forces.
Water, which is a chemical compound of hydrogen and oxygen in the ratio two hydrogen atoms for every oxygen atom, contains H2O molecules.
The lancelets consist of approximately 32 types of
fish-like maritime chordates in the order of Amphioxiformes,
with an international dissemination in tropical seas and low temperate, they are commonly found half-buried in sand. The lancelets show 4 of the major
characteristics of the phylum chordata.
<span> </span>
