The good thing about standards is that there are so many to choose from!

[pne]

For fun, I entered “standard temperature and pressure” into Wolfram Alpha… and got results, with a bar at the top saying Assuming STP (0°C, 100 kPa) | Use STP (0°C, 101.3 kPa) or more [STP (15°C, 101.3 kPa), STP (60°F, 14.7 lb/in^2), STP (20°C, 100 kPa), STP (20°C, 101.3 kPa), STP (25°C, 100 kPa), STP (25°C, 101.3 kPa)] instead.

Heh. So much for “standard”.