* The fresh air invigorated me after the long drive. (Air as a general concept)
* The balloon floated effortlessly in the warm air. (Air as a medium)
* We had to hold our breath as we dove into the murky water, the air bubbles rising slowly. (Air as a substance)
* There was a strange, metallic smell in the air after the explosion. (Air as a container for smells)
Let me know if you'd like me to create sentences with different meanings or specific contexts!