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→About Standard Temperature and Pressure
: '''Standard pressure''' is around 101,000Pa of [[Atmospheric Pressure|atmospheric pressure]] because that is the [[pressure]] on our bodies when we are at [[Sea Level|sea level]].
: '''Standard temperature and pressure''' is used to describe whether a [[substance]] is a [[solid]], [[liquid]] or a [[gas]] under normal conditions.
: [[Substance]]s can change their [[State of Matter|state of matter]] depending on the [[temperature]] and [[pressure]] around them. So when stating something as a [[solid]], [[liquid]] or [[gas]] it's important to note the [[temperature]] and [[pressure]] that at which this is true.
===Examples===
: [[Water]] is a [[liquid]] '''STP''' (At standard temperature and pressure). If the [[pressure]] is reduced to zero then [[water]] becomes a [[gas]].
: [[Oxygen]] is a [[gas]] '''STP'''. Increasing the [[pressure]] or decreasing the [[temperature]] of [[Oxygen]] can cause it to become a [[liquid]].