It is relatively simple to weigh the air, a sealed skin bag, keep pumping with a pump to compress the air as much as possible, and then tie the seal tightly, put it on the balance, and put a weight on the right side to keep the balance on both sides. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 info weighing balances are different from general boom balances, but pallet balances, which are for weighing convenience.

After reaching equilibrium, Ma Zhou took off the bulging skin, unsealed it, and the compressed air was released, spraying it on the ground, and immediately raising countless dust.

"That's the wind from the air." Wang Mai explained to Li Er next to him.

Li Er looked at Ma Zhou curiously, he already understood the principle a little, and just waited for the final result to come out to verify the guess in his heart at this time.

After deflating, Ma Zhou put the deflated leather bag on the scale, and the trays on both sides of the scale swayed back and forth, and finally the side with the weight was slightly lower.

"Sure enough." Li Er nodded, he didn't expect this qi to really have weight.

"There is a lot of knowledge in this qi, and now the world only understands some skins, if you can uncover the mysteries, then the use of qi will produce infinite power." Wang Mai said.

"What's the power?" Li Er asked.

"Flying in the sky, turning over rivers and seas, omnipotent...... Wang Mai described the power of the air in mysterious language as much as possible. However, it is not an exaggeration to say that the airplanes of later generations are related to aerodynamics, the operation of the internal combustion engine is inseparable from the air pressure, and even the pressure cooker for cooking at home is also using the characteristics of the boiling point of water under high air pressure to increase the temperature.

"This ......" When everyone heard this, wouldn't it be like a fairy-like means, this Wang Mai was really a fallacy to confuse the public, but looking at his face so calm, it didn't look like he was cheating. This person's research on qi has a height that ordinary people can hardly reach, and when others say this, everyone must think that it is nonsense, but when it comes from his mouth, it has to make people think deeply.

Previously, at the Confucian event held in Luoyang, this person discovered two magical qi, one can revive the ashes of Mars, and the other can actually ignite, which shakes the theory of Yuanqi that has been ruling for hundreds of years, proving that qi is not a single thing, and there are many ingredients in it. Someone in Chang'an was inspired by him before and collected biogas in the gutter, which was also a little bit. Later, I heard people in Shu say that there were many fire wells in Shu that boiled salt brine were used as fuel by this kind of gas that could be ignited.

Li Er was also suspicious: "I'm afraid that Mr. Wang's words are a bit exaggerated, right?" ”

Wang Mai smiled, walked to Li Er's side and whispered a few words, Li Er's expression changed from disbelief to consternation: "This is true? ”

"The stakes are very high, how can you joke with me, Your Highness doesn't believe it, you can follow me to have a look."

Li Er nodded solemnly: "Okay!" ”

Everyone next to them was at a loss, not knowing what this Wang Mai said to Li Er, which caused such a big reaction from His Royal Highness King Qin.

Li Er's expression quickly returned to normal, and he led everyone upstairs and asked, "You said that the landing point of the ballista can be well controlled, so isn't this weapon very dangerous?" If it falls into the hands of the enemy, will there be endless troubles? ”

"There is a very simple truth, the more complex the weapon, the higher the knowledge support, only by mastering the matching knowledge, can the maximum power of the weapon be brought into play." Wang Mai replied.

"It makes sense." Li Er thought about it for a while, and then understood the truth. Wang Mai's meaning is very simple, if the enemy even surpasses you in this area, then even if you lose, it can be regarded as convincing, which means that you have been comprehensively crushed.

"There's a story called the catfish effect," Wang said, "and it's said that fishermen at the beach put the fish in containers when they caught them, but when they returned to the shore, the fish in the container often died of suffocation in the middle of the process, and they couldn't sell them for a good price. Later, a clever fisherman finally came up with a solution, and after using this solution, his fish returned to the shore and was still alive and sold for a high price. Do you know what the fisherman has done? ”

"This ......" Everyone was at a loss, many of them had never even seen the sea, how could they know about the problem of fishing.

Li Er smiled: "This king knows, since you said that it is the catfish effect, then this method is naturally related to catfish." ”

"That's right," Wang Mai nodded, "he put a catfish in a container containing fish, catfish is a carnivorous fish, and the other fish are very afraid of being eaten when they see the catfish, so they swim desperately, this is the fisherman's secret." ”

"It really makes sense," Li Er applauded the clever fisherman, "This method is very good, in this way, only a small catfish is needed to harvest a boatload of live fish, and even if a few catfish are eaten by this catfish in the middle, the loss is negligible." ”

"Look around, Datang's enemies abound, but it is precisely because of the existence of these enemies that we keep working hard, the enemy is learning from us, we are trying our best to learn and improve ourselves in order not to let the enemy surpass, if there is a day when the horse really puts Nanshan swords and guns into storage, it is not that the enemy does not exist, but we have lost the sense of crisis, which is not far from disaster."

Mencius said: Born in sorrow and died in peace. This king thinks that this catfish effect has the same effect as it. ”

Wang Mai nodded: "So we are not afraid that the enemy will learn from us and imitate us, because we Tang people have this self-confidence, even if the enemy is strong, they can only look back on us." ”

"Hahaha......" Li Er looked up to the sky and laughed, although Wang Mai's words were a little flattering, but it was undoubtedly a great confidence in Datang.

Only those who have no confidence in themselves will blindly pursue self-preservation, and their minds are sensitive and fragile, and they cannot withstand any wind and waves. Wang Mai thought of some people in later generations, and compared the height of the country and the nation with the Tang people at every turn, this mind and self-confidence are simply worlds apart.

The national psychology of later generations appears in two extremes, extreme conceit or extreme inferiority, the former is manifested in many ways, Yelang is arrogant, intoxicated with the little achievements that have been made so far, desperately slandering, belittling and belittling the rest of the world, blind self-confidence, and interpreting some things according to his own wishes and imagination.

The latter is just as ridiculous, when it comes to foreign countries, everything is good, including political systems, economic levels, and even cultural thoughts, etc., and as soon as they compare it with China, they immediately slander it, saying that they are useless, as if the West and China are really the difference between heaven and hell.