Sound waves consist of air molecules vibrate back and forth. Each time, the molecules were packed in several places, resulting in a high pressure region, but elsewhere stretched, resulting in a low pressure area. High and low pressure waves alternately moving in the air, spreading from the sound source. This sound wave delivers sound to the human ear, sound waves are longitudinal waves.
Molecule is defined as a group of atoms (at least two) that bind to each other is very strong (covalent) in a specific arrangement and electrically neutral and fairly stable.According to this definition, different molecules with polyatomic ions. In organic chemistry and biochemistry, the term is used in a less rigid molecules, organic molecules and biomolecules that were considered included the charged molecule.
In the kinetic theory of gases the term molecule is often used to refer to any gas particle does not depend on its composition.According to this definition noble gas atoms is considered as a molecule, although these gases consist of a single atom that is not binding.
A molecule may consist of atoms that berunsur same (eg oxygen O2), or composed of different elements (eg water H2O). Complex atoms and the associated non-covalently (eg, bound by hydrogen bonds and ionic bonds) is generally not regarded as a single molecule.
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