The process of tin plague

/kloc-in the winter of the 0/9th century, the weather in Petersburg, Russia was extremely cold. The military warehouse keeper in Petersburg issued brand-new military coats to the army. After receiving these military coats, the officers and men found that all the military coats had no buttons. They were very angry and complained to the tsar. The tsar flew into a rage and ordered the minister who supervised the military uniform to be severely punished. The minister begged the czar to give him a few days to investigate.

When the minister arrived at the warehouse, he saw that other uniforms had no buttons. The administrator told him that the uniform had buttons when it was put into storage. Why is the button of the military uniform missing in the warehouse? The minister was very surprised. After careful observation for a while, he found that the thread for nailing buttons was not cut, but there was a small pile of gray powder at every button-nailing place. The administrator told him that the buttons originally nailed to the military uniform were made of tin.

"Why did the iron buttons turn into gray powder in the warehouse?" The minister was puzzled and went to the Petersburg Academy of Sciences and asked them to explain. Scientists have racked their brains for this problem. Later, a scientist ran to the minister and said that he could solve the mystery. With a grain of salt, the minister took the scientist to see the tsar, saying that the tin button turned into powder because it was frozen in the sky. The tsar doesn't believe it, and scientists have to produce evidence. The scientist asked for a tin hip flask and put it on a stone table in the garden. A few days later, scientists and ministers accompanied the czar to the garden to observe the tin cans. At first glance, the tin pot was still there, and the tsar and ministers stared at the scientist in unison. The scientist confidently walked to the tin can and poked it gently with his finger. The tin can collapsed like a pile of sand and became a pile of powder. Scientists explained that the tin buttons and tin flagons on military coats were frozen into tin powder because the weather was particularly cold this winter.