air, gas; steam, vapor; anger
Phonosemantic compound. 米 represents the meaning and 气 represents the sound. Based on the original meaning "gift of grain", now written as 餼. The current meaning "air" is a phonetic loan.
《說文》：“氣，饋客芻米也。从米，气聲。《春秋傳》曰：‘齊人來氣諸矦。’，氣或从既；餼，氣或从食。”
gift of grain