The kanji 汽 primarily represents steam or vapor, often related to the concept of something that rises or evaporates. It implies a state of being gaseous or produced by boiling.

・On-yomi (音読み): キ (ki) ・Kun-yomi (訓読み): None, as the meaning is conveyed through compound words.

⚫︎ 汽車 Translation: Train (literally, "steam vehicle") ⚫︎ 気化 Translation: Vaporization; evaporation ⚫︎ 蒸気 Translation: Steam

The kanji 汽 is a phono-semantic compound (形声文字, けいせいいもじ). It combines the radical 氵 (水 - water) on the left side, representing the semantic component (meaning), with the phonetic component 气 (氣 - air/gas). The water radical indicates the connection to water or a liquid, while the phonetic component suggests the sound or the nature of vapor. Thus, 汽 visually represents steam/vapor by connecting it with water-related characteristics.