Measurement

Standardbedingungen (STP)

Definition

Der IUPAC-Referenzzustand für Gasmessungen: 0 °C (273,15 K) und 101,325 kPa (1 atm), bei denen ein Mol eines idealen Gases 22,414 Liter einnimmt.

Erklärung

Standard conditions allow meaningful comparison of gas volumes and reaction rates across laboratories. One mole of oxygen at STP occupies 22.414 L; at room temperature (25°C, 100 kPa) — the newer IUPAC standard conditions — it occupies 24.789 L, about 10.6% more. Always check which standard a source uses, since older chemistry texts use 0°C while newer ones use 25°C.

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