天然气 Traditional form: 天然氣 Pinyin (reading): tiānránqì Definitions: natural gas Characters: 天 - sky, heaven; god, celestial 然 - certainly; naturally; suddenly 气 - air, gas; steam, vapor; anger Traditional characters: 天 - sky, heaven; god, celestial 然 - certainly; naturally; suddenly 氣 - air, gas; steam, vapor; anger