The pressure will not affect the rate of solution.
Compressions are regions of high pressure due to particles being close together
rarefactions are regions of low pressure due to particles being spread further apart
Longitudinal waves are often demonstrated by pushing and pulling a stretched slinky spring
If you're talking about atoms then its a molecule
<span>If a psychoactive substance is used or abused over a long period of time, a person may be unable to function properly without it. An abuser can suffer extreme withdrawals.</span>