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You are watching: Under what conditions of temperature and pressure


Standard Temperature and also Pressure (STP) is defined as 0 degrees Celsius and 1 atmosphere of pressure.

Do not confuse STP through the STP commodities Company, a an equipment of oil and also fuel additives...unless you space reading one of their safety and security Data Sheets!

Additional Info

STP is offered in plenty of thermodynamic calculations and tabulations. Certain properties of issue such together density, viscosity, boiling allude etc. Will vary with transforms in temperature or pressure. Having actually one common set of conditions ("state") because that tabulating these values provides comparisons possible and eases calculations.

The ide of matter in its typical state (also referred to as "standard conditions") is closely related. "Standard state" walk not generally imply a details temperature, however 25 °C (298 K) is most regularly used:

State the MatterStandard State
Gas1 atm the pressure
LiquidPure liquid
SolidPure solid
Solution1 molar
ElementsThe most stable allotrope at STP, through
Gf0 = 0

Many chemistry calculations space for products that room in their standard state. One very useful rule for gases that does not necessarily need standard state conditions is the ideal Gas regulation (eq 1).



SymbolMeaningTypical Unit
n# of mole of materialmole
RThe appropriate Gas Constant0.08206 L.atm.mol-1.K-1

Using the best Gas Law, one deserve to determine the worth of any one of the 4 variables (P, V, n, T) if we understand the worth of the various other three (R is a constant).

For example, 1,000 grams (1 kilogram = 2.2 pounds) that ethylene (which has a molar massive of 28 grams/mol) will certainly occupy a volume the 800 liters at STP :


If us wished to calculate this volume at another, non-standard state temperature, such together 100 °C, we would simply substitute 373 K because that the temperature (100 °C = 373 K) in the over calculation. The right Gas regulation is a very handy equation for estimating gas nature at both standard and non-standard conditions.

SDS Relevance


Safety Emporium has actually all type of lab tools such together stirring warm plates.

The letters "STP" occur most typically on a security Data sheet after a physical residential property such together the density , flammable limit, or vapor push of the material. This properties are uncovered in section 9 (physical and chemical properties) of the SDS.

Remember: STP is 0 °C, NOT room temperature. Usually the properties at STP versus room temperature vary by less than 10% for gases and even less for liquids or solids. Because that example, in the calculation in the previous section, the volume would be 858 liters in ~ 20 °C, a distinction of 7%. And the density of water is 0.99987 g/ml at 0 °C matches 0.99823 g/ml in ~ 20 °C, a distinction of 0.16%.

However, sometimes the distinctions can be excessive - dimethylamine is a volatile liquid through a specific gravity the 0.680 in ~ STP, however it is a gas over its boiling point of 7 °C!

Further Reading

See also: fixed units, mole, push units

Additional definitions indigenous Google and also OneLook.

See more: Which Is A Structural Isomer Of 3-Isopropyl-5-Methylheptane?

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