Examlex
Explain what is meant by internal and external validity.
Hydrogen Bonds
These are weak bonds between molecules or within molecules that result from the attraction of a hydrogen atom to a highly electronegative element like oxygen or nitrogen.
Water Molecule
The smallest unit of water, consisting of two hydrogen atoms bonded to one oxygen atom, symbolized as H2O.
Surface Tension
The elastic tendency of liquid surfaces to acquire the least surface area possible, responsible for phenomena like droplets forming and the ability of some objects to float on water.
Polar
Relating to the poles of a planet, or exhibiting opposite characteristics at different ends of an axis.
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