Crossword Puzzle Gas leak warnings

Clue: Gas leak warnings

Principle involving the temperature and density of gases (CHARLESSLAW with 11 letters)
Gasoline brand (CITGO with 5 letters)
Gaspar brought one (GIFT with 4 letters)
Problem caused by gastric juice (ULCER with 5 letters)
Stop, as a leak (e.g. PLUG with 4 letters)
Gaseous matters (VAPORS with 6 letters)
Most common of the noble gases (ARGON with 5 letters)
Gasman's reading (e.g. METER with 5 letters)
Gasp of amazement (OOH with 3 letters)
Gastineau is one (JET with 3 letters)