Drink Black Tea Calmly at Hogwarts

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As the weather gradually warms up, the day of the second match of the Triwizard Tournament is getting closer and closer.

The ice floes on the lake have all melted, but the temperature of the lake is still frighteningly low.

Zhang Xu measured the temperature of the lake water with a thermometer, and it was only 4 to 5 degrees Celsius. It is estimated that by the end of February, the temperature will not rise too much.

Because of thermal expansion and contraction, water that expands when heated will float on the surface of the water, and the deeper the water, the lower the temperature. Theoretically, the water temperature in the deepest part of the water will be kept at about 4 degrees Celsius, where the water density is the highest.

The thermal conductivity of water is 26 times greater than that of air. The average person wearing ordinary clothes and keeping still can survive for about 60 minutes in water at 5 degrees Celsius, and about 3 hours in water at 10 degrees Celsius.

The most important thing is that the low temperature will make the hands and feet of people in the water numb, especially the palms and soles of people. There is no fat to keep warm here, and it is most likely to cause heat loss.

In addition, strenuous exercise in the water will also increase the loss of body heat.

When swimming in winter, when the water temperature is kept at 10-14 degrees Celsius, it is best for ordinary people to swim 100-500 meters in the water; and when the water temperature is lower than 10 degrees Celsius, the swimming time should be very strictly controlled.

However, this time is not enough to participate in the competition.

So we have to find a way to keep active for a long time in the low temperature lake water.

On the lake, away from the castle and Durmstrang's sailboats, a bonfire burned.

Beside the bonfire, a beautiful woman with long silver hair wrapped in a thick blanket and holding a cup of warm milk cocoa is leaning against a furry giant panda to keep warm.

Fu Rong had just come out of the lake, and she went into the water for the first time to practice tonight, but she came up after staying under the water for less than twenty minutes.

Although Fu Rong put on a thick diving suit, in the bitter lake, the help that the wet diving suit could provide was not as great as Zhang Xu expected.

Zhang Xu and Fu Rong, who have only dived in the Xisha Islands, do not know that under normal circumstances, diving suits are not required when the water temperature is above 27 degrees Celsius, and wet suits are required when the water temperature is lower than 20 degrees Celsius. A dry suit is required.

And dry suits suitable for use in cold water,

It takes professional training to use it proficiently, and Fu Rong has no way to participate in the training.

Therefore, Zhang Xu and Fu Rong, who suffered from ignorance, could only work together to find a way to solve the current problems they encountered.

After Furong recovered, she applied a "waterproof and moisture-proof" function to her diving suit, cast a bubble head spell on herself, and then walked towards the lake again.

Panda Zhang changed back into a human form, filled the campfire with a lot of firewood, and then put an iron pot beside the campfire.

After half an hour this time, Furong came out of the water.

"How do you feel this time?" Zhang Xu asked.

While asking questions, Zhang Xu raised his magic wand, and a gust of hot wind swirled around Furong, drying the newly landed Furong.

"It's better than before, but I still feel very cold." Furong replied.

Fu Rong rubbed her hands that were frozen stiff, and sat on the legs of the giant panda Zhang that had been transformed back into a leather sofa, and then put her hands close to the fire to keep warm.

"It would be great if I could hug a heater in the water." Fu Rong said while warming herself by the fire.

Furong's words caused Zhang Xu to think.

There are magics that can keep warm, but in the cold water, these magics are not very effective.

When a person is in the water, the gesture of waving a wand is easily deformed by the resistance of the water, and when chanting a spell, it is easier to slur the pronunciation due to the water pouring into the mouth.

You must try to use simple enchantments underwater, because simpler means less error-prone.

And using magic to keep warm in the water not only needs a lot of magic power, but also has to make up the magic spell from time to time, which makes it easier to make mistakes.

After thinking about it for a while, Zhang Xu decided that magic was not enough to be supplemented by science.

After transforming from the black and white leather sofa back into a human form, Zhang Xu took out a pack of warm babies from his treasure bag.

It took Zhang Xu a lot of time to help Furong pull off her diving suit and put it on to warm the baby. Next is her last practice in the water tonight.

After half an hour, Fu Rong came out of the water happily.

In the makeshift changing room created by Transfiguration, Fleur changed out of her diving suit and put on a robe.

"How do you feel this time?"

After Zhang Xu peeled off the skin of a warm roasted sweet potato, he asked as he handed the roasted sweet potato to Fu Rong.

"This time I feel much better," Furong said after receiving the roasted sweet potatoes. "Except for the coldness of the palms and soles of the feet, the body is not so cold anymore. It is no problem to stay underwater for an hour."

Zhang Xu nodded while nibbling on the roasted sweet potatoes.

"The next step is how to investigate underwater." Zhang Xu said, "Some residents in the lake are not friendly, and it is best to avoid them."

"The water in the lake is not as clean as it is in the South China Sea. The underwater visibility is very low, and the light is seriously insufficient. It is easy to be attacked by surprise." Zhang Xu said while knocking the mud outside a beggar chicken. shell.

"But if I use the lighting technique underwater, will it attract the enemies in the water?" Furong asked while taking a delicious chicken leg.

"There is a risk, but other than that, you can only rely on sound, and I don't think you can learn the skills of dolphins in a short time." Zhang Xu said.

Fu Rong thought for a while, and could only nod her head.

"Do you have any idea how to deal with the enemy underwater?" Zhang Xu asked.

"This is not a problem." Furong replied confidently.

After eating and drinking by the bonfire, the two extinguished the bonfire with water, and then returned to Hogwarts Castle together.

I went into the water three times tonight, and Furong was terribly cold.

Although he roasted by the campfire for a long time and had a hot supper, Zhang Xu still felt that Fu Rong's hands were still very cold.

After walking into the entrance hall of Hogwarts Castle, Zhang Xu took out the Marauder's Map and saw Harry and Ron in the prefect's bathroom.

The Warriors all knew that after the second game was played in the water, everyone started targeted practice.

The prefect's bathroom was naturally Cedric and Ron's first choice.

Zhang Xu also greeted Filch, telling him to ignore the actions of the two warriors.

So every time Zhang Xu and Fu Rong went to the prefect's bathroom, he would first use the Marauder's Map to check if there was anyone in it.

Zhang Xu, who planned to let Fu Rong take a warm bath before going to bed, had no choice but to take her to the professor's bathroom.

More than an hour later, Fleur and Scarlet walked out of the professor's bathroom talking and laughing together.

After sending Scarlet away, Fu Rong put down Zhang Xu who was hanging upside down on the top of the corridor in front of the bathroom door.