I make a popular science video and all the emperors learn from it!

[Popular Science Short Video Collection Series 2. ]

[V. Spreading salt to clear snow. ]

[Recently, many places in China have experienced heavy snowfall, resulting in serious snow accumulation on the roads and obstructing traffic. ]

[A wedding car team, the road to the wedding car was covered with snow. ]

[The man who was picking up the bride collected salt from local villagers, and went to the store to buy dozens of bags when it was not enough. ]

[The road that the car dared not go on was sprinkled with 50 kilograms of salt. ]

[This allowed the car team to set off smoothly. ]

[...]

[On the other side, on the highway. ]

[The police spread salt with a basin, with skillful techniques and a sense of rhythm. ].

[It seems to awaken the memory of spreading fertilizer when I was a child. ]

[...]

[Why now, no matter how heavy the snow is, the road can be passed quickly? 】

[This is because salt was sprinkled on the road. 】

[Why can salt make snow melt faster? 】

[Can't we sprinkle some chili powder? 】

[In fact, chili powder can make people sweat, but it can't melt snow. 】

[Salt is not only a condiment in our daily life, but also an efficient snow melter. 】

[Why can salt make snow melt faster? 】

[This is because the freezing point of salt water is below zero degrees. The salt solution contains chloride ions and sodium ions. The water vapor pressure corresponding to the salt solution will decrease. If the salt water is to freeze, the temperature must be below 0C. 】

[It can be understood that it takes 15% heat to turn salt into ice, and the heat released melts the snow. 】

[Therefore, after sprinkling salt, the snow is easier to melt. 】

[This is also one of the ways to make the road smooth quickly. 】

[Inorganic deicing agents with chloride salt as the main component are collectively called deicing salt, such as sodium chloride, calcium chloride, magnesium chloride and potassium chloride. 】

[Its advantage is that it is cheap. 】

[But it has a certain degree of corrosiveness. Common deicing agents in daily life belong to this category. 】

[In addition, there are organic deicing agents with potassium acetate as the main component. This type of deicing agent has a good snow-melting effect and is basically non-corrosive. 】

[But its price is 10 times that of deicing salt, and it is generally used in important places such as airports. 】

【......】

..................................................................

“Sprinkle salt to clear snow???”

“Fuck! Salt is so precious, isn’t it for eating?”

“Ah? I can’t bear to buy salt to eat, I usually just use vinegar cloth to rinse the pot, it’s a little salty, you don’t eat the salt, you sprinkle it on the road!?”

“Prodigal son! Have the descendants had too many good days and become unthrifty.”

“My goodness, the common people use salt as soil, and some even spread it in basins! Are they crazy, or am I crazy?”

"Could it be that all this salt was issued by the government? You can't spend money like this?"

"No, look, the salt looks so fine, not like the coarse salt we eat."

"......"

The collective mentality of the ancients in all dynasties was unbalanced.

Why?

Why?

They usually don't want to buy salt, that thing is too expensive!

But what did they see?

Later generations used salt as soil, and sprinkled it on the road in handfuls, just like it was free!

Even if spreading salt can remove snow, it can't be so wasteful.

With that little snow, just recruit a few hundred civilians and it will be shoveled away quickly.

.........................................................................

Han Dynasty.

Liu Bang opened his mouth slightly in surprise.

No, what's going on?

Just vomited, is this a hallucination?

Liu Bang picked up a glass of wine to rinse his mouth, rubbed his eyes and read it again.

"Hiss~~"

"In terms of squandering, who can compare with the people of later generations!"

"I have never seen such fine salt with full grains and snow-white color. You actually sprinkled it on the road to remove snow?"

"Salt can also remove snow?"

Liu Bang looked at the ministers around him in confusion.

Facing the gaze, Xiao He pondered for a moment and said: "Your Majesty, this... salt can melt snow. I have read it in a book."

"But I have never tried it myself."

He became less and less confident as he spoke.

I thought that he was a minister of the Han Dynasty, but he was reluctant to use salt to verify the view he had seen in the book before.

It's not that he didn't have money to buy salt.

I just feel a little reluctant to do it, it's too wasteful.

But later generations, they just sprinkled salt on the road, how can they look distressed?

Xiao He's mentality exploded, and suddenly he felt that his position as prime minister was not good at all, even worse than ordinary people in later generations.

Liu Bang was even more surprised when he heard it, "Oh, it's true!"

He was numb.

Even he didn't notice this phenomenon.

Later generations use it very skillfully in life.

Liu Bang's eyes lit up, and he said excitedly: "Later generations must have obtained new technology for salt production, and they can be so wasteful without lacking salt."

Just thinking about it.

I saw a pop-up window pop up in the light curtain for the first time in a long time.

[Limited time question and answer session. ]

[Answer the following questions correctly within 30 seconds to get the corresponding rewards. ]

[What is the principle of spreading salt to remove snow? 】

[Option 1: When salt dissolves in water, it releases heat. 】

[Option 2: Salt water has a lower freezing point. 】

[Option 3: Friction generates heat. 】

[Option 4: Because of the theory of relativity. 】

Liu Bang quickly scanned the answer.

He skipped the options he didn't understand.

Finally, he hesitated between option one and option two.

His many answers helped him quickly rule out option one, the misleading option!

Liu Bang shouted loudly: "Option one!"

Then he waited quietly for the countdown to zero.

[Correct answer! ]

[Congratulations to the following 206 emperors for their correct answers: Liu Bang of the Han Dynasty, Liu Che... Ying Zheng of the Qin Dynasty, Li Shimin of the Tang Dynasty...]

[Award: Refined salt technology. ]

The next second.

There was an extra book in Liu Bang's hand. He glanced at it and felt like he had found a treasure!

This technology can not only extract fine salt with almost no impurities, but also greatly increase the output of salt!

Excitedly, he shouted to all around: "Send the craftsmen to the palace quickly. I want to spread this method throughout the country so that every citizen can afford salt and eat fine salt!"

.......................................................................

710

Tang Dynasty.

Li Shimin touched his chin in confusion and pondered.

"Use salt to melt snow?"

He was shocked.

The future generations can always come up with eye-popping operations!

Using salt is much more expensive than using people!

Will the future generations not be able to calculate? ?

I have never learned arithmetic...

But he soon let it go because he got the technology to refine salt.

It was then that he suddenly realized.

Li Shimin was surprised and said, "Oh, so that's how it is. He has such a skill. No wonder he wastes so much."

"Come here, call the craftsmen into the palace!"

"I will also use salt to remove snow in the future!"

There was a hint of heroism in his words.

.........................................................................

Ming Dynasty.

After being shocked, Zhu Yuanzhang was so happy that he couldn't close his mouth.

"Biao'er, come and see this thing."

"With it, our people in the Ming Dynasty, who still don't have enough food, can eat salt as much as they want."

After Zhu Biao approached, he took a quick look and replied respectfully, "Congratulations, father! I thank you for the people of the world."

Zhu Yuanzhang laughed.

Then he pondered: "Hmph, but we must master this technology in our own hands."

"All the money earned will be used to fill the national treasury."

"If we give it to those profiteers, they might raise the price of fine salt to any high level."

"Father is wise!" Zhu Biao's eyes lit up.

This is a good idea.

The Ming Dynasty can finally have one more, a good business with huge profits! .