Standard Temperature and Pressure
It is used to describe a substance at....
Pressure: 1 atm; 760 mmHg; 101,300 pascals
Temperature: 0°C, 32 F, 273.15 K (kelvin)
It is often used to describe gasses.
The water was starting to freeze at STP.
At STP one mole of gas will occupy 22.4 liters.
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