Weatherglass
A weatherglass, also known as a storm glass or liquid barometer, is a type of instrument used to predict changes in weather conditions. It consists of a sealed glass container filled with liquid and various substances that react to changes in atmospheric pressure. As the pressure changes, the appearance of the liquid and the formation of crystals within the container can indicate whether the weather will be fair, cloudy, rainy, or stormy. Weatherglasses have been used for centuries as a way to forecast the weather based on these natural reactions.