• 気温きおん — temperature
• 気圧きあつ — atmospheric pressure
• 気楽きらく — carefree; easygoing
• 気持きもち — feeling
• 気配けはい — presence; sign
• 元気げんき — healthy; energetic

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The character “気” originally represents steam or vapor rising — a symbol of energy, breath, or atmosphere. It appears in many common phrases and plays a big role in describing emotions or unseen forces in daily life.