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# What are standard temperature and pressure? Why was Standard needed?

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- 1 decade agoFavorite Answer
STP = Standard Temperature and pressure is defined as 273K (0 C, 32 F)and 101.325kpa (kilopascals). A standard was needed to measure the density of gasses and the effect that changes in temperature and pressure have on this density. These values approximate the freezing temperature of water and atmospheric pressure at sea level.

SATP = Standard Ambient Temperature and Pressure is defined by the values 298K (25C) and 101.325kPa

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