What is storm glass weather predictor?

A storm glass weather predictor is a type of weather forecasting instrument that consists of a sealed glass container filled with a solution of distilled water, camphor, potassium nitrate, ammonium chloride, and ethanol. The appearance of the liquid inside the glass container can change in response to changes in atmospheric pressure, temperature, and humidity, allowing it to be used as a rudimentary weather predictor.

The storm glass was invented in the early 18th century by British naval captain Robert FitzRoy, who used it on his voyages to help predict the weather. The principle behind the storm glass is based on the fact that changes in atmospheric pressure can cause the liquid inside the glass container to expand or contract, leading to changes in its appearance.

By observing the changes in the liquid inside the storm glass, users can make rough predictions about the weather. For example, if the liquid becomes cloudy or forms crystals at the bottom of the glass, it can indicate the likelihood of precipitation, while a clear liquid may suggest fair weather. However, the accuracy of storm glasses as weather predictors is limited, and they are best used as a fun and decorative way to monitor atmospheric changes rather than a reliable forecasting tool.