Gas
Gas means a material which has a vapor pressure greater than 300 kPa (43.5 psia) at 50 C (122 F) or is completely gaseous at 20 C (68 F) at a standard pressure of 101.3 kPa (14.7 psia).
Source
49 CFR § 171.8
Scoping language
In this subchapter,
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