How did the ancients in China measure the temperature?

In fact, as early as the pre-Qin period, China had a "bottle" that could observe the temperature change: the bottle was full of water, and if the water froze and the temperature was below zero, it entered the cold winter; If the ice melts, the temperature will rise. This kind of bottle is called "ice bottle" or "water bottle", which is the most primitive thermometer in China and regarded as the embryonic form of modern thermometer.

What shape measuring tool is an ice bottle? Modern archaeology has not yet found the real thing, but according to the literature, it was used in the pre-Qin period in China. There is a saying in Lv Buwei's "Lu's Spring and Autumn Annals Shen Dalan Cha Jin": "A bottle of water sees ice, which shows that the cold of the world is hidden by fish and turtles." The general meaning of this sentence is that when you see the water in the bottle frozen, you know that the weather is cold and the fish and tortoise are hiding. This is a technique that the ancients used the morphological changes of water-ice-water at different temperatures to infer the temperature rise and fall.

As for whether this "bottle" is a "thermometer", there is no specific explanation in the literature. Perhaps because of this, the original thermometer, the ice bottle, has not been valued and recognized by modern academic circles, and has been mistaken for an ordinary living vessel.

From Tencent.com? Ni Liufang, author of encyclopedia knowledge?