Stable Isotopes

STP vs. NTP Gas Volume

ISOTEC® reports all gas volumes at Standard Temperature and Pressure (STP), while some suppliers quote their gas volumes at Normal Temperature and Pressure (NTP). One STP Liter is 7.7% more gas than one NTP Liter. Use this handy calculator to compare cost:

STP to NTP Cost Calculator
Enter Dollars per STP Liters
Enter Dollars per NTP Liters