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Standard Temperature and Pressure (STP) Standard Temperature and Pressure (STP) is defined as 0 degrees Celsius and 1 atmosphere of pressure. Do not confuse STP with the STP Products Company, a maker of oil and fuel additives...unless you are reading one of their MSDS's!
The standard unit of measure for pressure is the pascal which is abbreviated as Pa.. It is also the newton per square meter as shown by the formula above. Other units that are used for pressure include pounds per square inch (psi), the bar, and the standard atmosphere (atm). Example problems: