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Chapter 113 Bianjing Shengjing
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Chapter 115 have you heard of science
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... e on the street.
But in the current ancient Song Dynasty, it is not easy to drink a bowl of iced sour plum soup in summer.
I don’t know if this old man has an ice cellar in his home, or does he use saltpeter to make ice?
The heat-absorbing function of saltpeter was discovered in the late Tang Dynasty. When dissolved in water, it will absorb a lot of heat, reducing the water temperature and even freezing it.
So since then, making ice with saltpeter has gradual ...
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