noun

A "barometer" is a tool used to determine atmospheric pressure. It can be used to predict changes in weather and help understand the weight of the air surrounding us.

Example

1. The barometer showed that the air pressure was falling, indicating a storm was on its way.
2. He checked the barometer before setting out on his hike to ensure that the weather was stable.
3. The barometer is a valuable tool for meteorologists to make weather predictions.