Meaning: On Saturdays, the ice cream shop is full of people laughing and having fun.
Choice of Words: Saturday is the sixth day of the week, and fills the air means to spread throughout an area.
Alternative Expressions
On a Saturday, the air is filled with laughter.
Meaning: On Saturday, there is so much laughter that it can be heard everywhere.
Choice of Words: **On a Saturday:** On the day of the week called Saturday. **The air is filled with laughter:** The laughter is so loud and present that it seems to take up all the space in the air.
Every Saturday, the sound of laughter fills the atmosphere.
Meaning: Every Saturday, there is always a lot of laughter that can be heard in the air.
Choice of Words: **Every Saturday:** Every week on the day called Saturday. **The sound of laughter:** The noises made when people laugh. **Fills the atmosphere:** Spreads through the air around.