What is the scientific truth of "seeing the sky with salt"?

An old man led the villagers to travel day and night, transporting salt to a place and replacing it with barley for the winter. One night, they camped out in the wild and the stars shone. The elders still used the method handed down from generation to generation to take out three pieces of salt and put it in the fire to predict the weather changes in the mountains. Everyone is waiting for the old man's "weather forecast" If you hear the crack of salt in the fire, it is a sign of good weather. If there is no response, it means that the weather is about to get worse and the wind and rain will come at any time. The elderly look serious because salt is silent in the fire. He thought it was unlucky and advocated that it should be done immediately after dawn. But another young man in the clan thinks that "salt looks up to heaven" is too superstitious and opposes leaving in a hurry. The next afternoon, as expected, the weather changed suddenly and there was a storm. Young people who insist on leaving late believe the experience of the old man. In fact, it is scientific for the elderly to do so. Whether the salt block makes sound in the fire is related to the humidity in the air. The wind and rain came, the humidity was high, and the salt was wet, so it naturally became dumb when put into the fire. On the contrary, salt makes a sound. Young people look down on the experience of the elderly and think that they are outdated and useless. In fact, some people's experiences are like sea salt. No matter how old it is, it is still a crystal, and it has the memory of the sea. People can't live without it. In other words, without the experience of our predecessors, we will still live in primitive society and live an animal-like life. However, living by experience, always putting on an experienced shelf everywhere, like driving old cars and taking the old road, will only be eliminated by society.