human
What is a clue that a chemical reaction might be taking place?
gpt
The formation of gas bubbles is a clue that a chemical reaction might be taking place.
Explanation: The formation of gas bubbles, also known as effervescence, often indicates that a chemical reaction is occurring, releasing gases such as carbon dioxide, oxygen, or hydrogen. This can be a sign of a chemical reaction in various fields, including chemistry, biology, and engineering.