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==Key Stage 4==
===Meaning===
'''Standard Temperature and Pressure''' is around 20°C and 101,000[[Pa]]000Pa.
===About Standard Temperature and Pressure===
: '''Standard temperature''' or '''room temperature''' is around 20°C because that is the [[temperature]] [[human]]s are most comfortable in.
: '''Standard pressure''' is around 101,000[[Pa]] 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 this is true.