Barometer

Real World Example

Imagine you're trying to gauge how crowded a coffee shop is before deciding to enter. Just like peeking through the window to see the number of people inside helps you decide whether it's too busy or just right, a barometer measures air pressure to help predict weather conditions. In this analogy, the window is the barometer, the people are the air molecules, and the crowd level is the air pressure; both give us valuable information about what's happening in an environment, allowing us to make informed decisions.