Is the weather forecast bottle accurate?

The full name of the weather forecast bottle is the weather forecast bottle, also known as the storm bottle, and the English name is storm glass. Among these inventors, it is said that one is meteorologist robert fitzroy, who is the captain of Darwin's Beagle. He mixed distilled water, camphor, ethanol, potassium nitrate and ammonium chloride into a solution and sealed it in a glass bottle. As the weather changes, the crystallization of the solution in the bottle will change differently. Observing the crystal can predict the weather.

Then all kinds of sellers on Taobao said that they could predict the weather-"When the liquid in the bottle is clear and clean, it means the weather is fine; When the liquid in the bottle is turbid and hazy, it means the sky is gloomy; When there are big crystals in the bottle, it means that the temperature will drop and even snow. " First of all, although the weather is ever-changing, in the final analysis, it is nothing more than changes in temperature, humidity and air pressure. For the gas cylinder, because it is closed, the humidity and air pressure will not be affected, only the temperature can really be affected.

We can look at several kinds of weather that gas cylinders claim to be predictable: sunny, cloudy, cloudy, snowy and snowstorm. These weather conditions are not only controlled by temperature. For example, when cold air comes, the temperature drops (the weather bottle can capture it), but whether it snows depends on the water vapor transport conditions (the weather bottle can't capture it), so how can the weather bottle judge it snows? There are also cloudy, sunny and cloudy weather phenomena, which may occur under the same temperature conditions. The only difference is the amount of clouds in the sky (less than 30% in sunny days, more than 70% in cloudy days and cloudy in the middle).

How does the weather bottle get the information of sky cloud cover? Secondly, because the gas cylinder depends entirely on the change of temperature, it is obvious that it must be placed outdoors in order to fully contact the atmospheric temperature. But almost all the advertisements and introductions don't mention this, and most of the pictures are put indoors-which is consistent with its delicate and fragile appearance. In today's living room conditions, with the appearance of heating in winter and air conditioning in summer, the change of room temperature is getting smaller and smaller. In this case, the gas cylinder can't even reflect the real temperature, let alone predict the weather change in advance.