ideal gas idealess • idealisation · · · Info · Definitions · Synonyms · Characters · · ideal gas · · Text Common · · Latin · · Scripts 9 · · Length 3 · · Syllables Definitions · · · (noun) a hypothetical gas with molecules of negligible size that exert no intermolecular forces. Synonyms: ideal gas, perfect gas. · · Noun Definition 1 Synonyms · · · perfect gas · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 l latin small letter l U+006C s latin small letter s U+0073