Has anyone heard of gas cylinders? What is that?

Since ancient times, various farming civilizations have attached great importance to calendar and meteorological observation. In the era of marine civilization, the demand for weather forecast has increased even more-if you suddenly encounter a storm at sea, it is no joke. Because of this, in that era of underdeveloped technology, people began to actively study the equipment that can reflect the weather. /kloc-At the end of 0/8th century, a weatherman named Storm Glass appeared. It is said that it can sensitively sense the changes of light, heat and air pressure in the atmospheric environment. Once the weather changes, the chemicals in the bottle will undergo a series of changes, become turbid and grow crystals of different shapes. This is the source of the gas cylinder now. Because many original materials of Fengfeng bottle have been scattered, the original formula is unknown, and even the inventor is unknown, but this invention was improved by many scientific people in the19th century. In the "research and development history" of Feng Fengping, the most noteworthy figure is Robert? The three-masted sailboat Beagle, commanded by Captain fitzroy, took Darwin on that famous global expedition. Relatively unknown, Captain fitzroy is also a meteorologist, who has done a lot of weather forecasting and monitoring. Fitzroy also determined the basic formula of the storm flask: distilled water, ethanol, camphor, potassium nitrate and ammonium chloride, which were used in the voyage of the Beagle. According to the records at that time, it is considered that this formula of storm flask can predict sunny days, cloudy days, storms, fog and snow. It is said that the method of judging the weather is also very simple: the bottle is sunny, which is sunny; If it is cloudy, it means cloudy; If the cloud-like liquid is still dragging the star-shaped precipitation, it goes without saying that a storm is coming. This description is really a bit like "water knows the answer". kknews.cc/news/grn8o9