Where has the fizz gone from your lemonade?

The fizz in my lemonade has likely dissipated due to carbonation escaping over time. When opened, Carbonated Beverages lose their bubbles as the pressure decreases, allowing carbon dioxide to escape into the air. Additionally, if the lemonade has been left uncovered or stored improperly, it can go flat even faster. To restore some fizz, I could try adding fresh soda water or serve it over ice.