Final answer:
The presence of bubbles in a liquid indicates the formation of vapor and a chemical reaction. Surface tension is also responsible for the formation of bubbles in liquids.
Step-by-step explanation:
Bubbles observed in a liquid indicate that vapor is being formed, which suggests that a chemical reaction is taking place. This observation is relevant in understanding how chemicals work and is essential in understanding how living things function. The formation of bubbles can also be explained by surface tension, which is caused by cohesive forces between molecules in liquid.