Therefore, when they heard Zhang Shou actually used the official hu to demonstrate such a mathematical problem in public, they looked at each other in bewilderment. Then Zhang Shou asked Ah Liu to bring a blackboard and quickly calculated the volume of a standard official hu, which was nothing to them.
What surprised them was the series of bulk density data of different types of grains that Zhang Shou then gave them.
From indica rice, japonica rice, wheat, barley, sorghum, corn, soybeans... all kinds of data flowed out from Zhang Shou's pen. A group of people who have always believed that astronomy and numerology are profound studies were shocked to see that mathematics, besides being related to taxes and granaries, could also be used in such places.
"Why do we need to calculate bulk density? It's very simple. If the bulk density of grains of the same volume is different, then the final weight will be different. This is related to the moisture content, the storage time, and the storage temperature..."
I watched Zhang Shou writing and drawing on a blackboard again, telling about the heights of the grain pile in his own granary in Rongshui Village that he had measured six months, one year, and one and a half years later. He verified that the gaps between grain grains decreased and the bulk density increased. He finally came to the conclusion that for the same hectoliter of grain, old grain is heavier than new grain.
As for the derivation process and the force decomposition, the audience felt that Zhang Shou's initial statement that he would explain it in a simple and easy-to-understand way was simply a lie! The previous demonstration was very simple, but they could only understand one conclusion of the latter part, and did not understand the rest at all!
Not to mention them, even Dean Yue and Dean Xiao, who were quite knowledgeable in various subjects, felt that the smiles on their faces were a little stiff at this moment.
Although they all have their own specialties, they also need to make calculations when they build canals, water conservancy projects, design gardens, and boats, etc. But it seems that they are all developed and expanded on the basis of their ancestors. Who could deduce something else like Zhang Shou
Ye Mengqiu, who had been prepared, directly took out the prepared paper roll. One of his senior brothers was responsible for grinding the ink, and another was responsible for stretching the paper, while he picked up the pen, dipped it in ink, and quickly began to take notes.
Even though he couldn't see what Zhang Shou wrote on the blackboard from his angle, he was still writing as Zhang Shou spoke. Having been trained in Jiuzhang Hall and Zhang Garden, he listened attentively and wrote as fast as he could. Facing this scene, the other special talents who were proficient in astronomy and numerology and were sitting near them seemed a little embarrassed.
Some people prepared cheat sheets and brought counting sticks, but no one thought they could remember what Zhang Shou said. Some people were proud of their master's inheritance and didn't want to ask others, but some immediately greeted Ye Mengqiu's senior brothers. When Zhang Shou stopped lecturing on this part of the class, several people had already agreed to borrow the notes.