The tutor comments on the difference between SATP and STP.

STP: Standard Temperature, Pressure: 273.15K (0°C), 101.3kPA.

SATP: Standard Ambient Temperature, Pressure: 298.15K (25°C), 101.3kPA.

Back in the early 90s, one of my professors predicted the adoption of SATP: “Most people don’t conduct experiments at 0°C.” He pointed out that 22.4L/mol at STP means 24.5L/mol at 25°C, 101.3kPA: the conditions now referred to as SATP.

HTH:)

Source:

Mortimer, Charles E. Chemistry, sixth ed. Belmont: Wadsworth, 1986.

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