Drink Black Tea Calmly at Hogwarts

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As the weather gradually warms up, the days for the second match of the Triwizard Tournament are getting closer and closer.

The floating ice on the lake surface has all melted, but the temperature of the lake water is still terribly low.

Zhang Xu used a thermometer to measure the temperature of the lake water, 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, the heated and expanded water will float on the surface, 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 larger than that of air. The average person wearing normal clothes and staying 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 low temperature will numb the hands and feet of people in the water, especially the palms and soles of the feet, where there is no fat to keep warm, and it is most likely to cause the loss of heat.

In addition, vigorous exercise in the water will aggravate the loss of heat in the body.

During winter swimming, when the water temperature is maintained at 10-14 degrees Celsius, it is best for 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 for participating in the competition.

So we have to find a way to stay active for a long time in the cold lake water.

A bonfire was burning on the lake, far from the castle and Durmstrang’s sailing boat.

Next to the campfire, a beautiful woman with long silver hair wrapped in a thick blanket, holding a cup of warm milk cocoa in her hand, was leaning against a furry panda to keep warm.

Furong had just come out of the lake. She went into the water to practice for the first time tonight. As a result, she only stayed underwater for less than twenty minutes before she came up.

Although Furong put on a thick diving suit, the help provided by the wet suit in the biting lake was not as great as Zhang Xu had expected.

Zhang Xu and Furong, who have only dived in the Paracel Islands, don’t know. Under normal circumstances, diving suits are not required when the water temperature is above 27 degrees Celsius. Wet diving suits are required when the water temperature is lower than 20 degrees Celsius. When the water temperature is below 10 degrees Celsius You need to wear a dry diving suit.

Moreover, dry wetsuits suitable for use in cold water must be professionally trained to be used proficiently, and Furong cannot participate in the training.

So Zhang Xu and Furong, who suffered a loss of knowledge, can only find a way to solve the current problems together.

After Furong recovered, she applied a "waterproof and moisture-proof" to her wetsuit, cast a bubble spell on herself, and then walked into the lake again.

Giant panda Zhang turned back into a human form, filled a lot of firewood on the bonfire, and then placed an iron pot beside the bonfire.

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

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

While questioning, Zhang Xu raised his magic wand, and a hot wind swirled around the lotus, drying the lotus that had just landed.

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

Furong rubbed her stiff hands, sat on the legs of the giant panda who had reverted to the leather sofa, and then put her hands near the fire to warm her.

"It would be great if I could hold a heater in the water." Furong said while warming herself.

Furong's words aroused Zhang Xu's thinking.

There is no magic that can warm, but in cold water, these magics are not very good.

When a person is in water, the gesture of waving a magic wand is easily deformed due to the resistance of the water, and when a man is chanting a spell, it is more likely to be illegible when water is poured into the mouth.

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

The use of magic in the water for heating not only requires a lot of magic power, but also has to make up the spell from time to time, which makes it easier to make mistakes.

After thinking for a while, Zhang Xu decided that magic was not enough to make up for it scientifically.

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

Zhang Xu took a lot of time to help Furong open the wetsuit to warm the baby. The next step was her last diving practice tonight.

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

In the temporary dressing room conjured by the transformation technique, Furong changed into a diving suit and put on a robe.

"How do you feel this time?"

After Zhang Xu peeled the skin of a hot roasted sweet potato, he asked Furong while passing the roasted sweet potato.

"It feels better this time," Furong said after taking the roasted sweet potatoes. "Except for the cold palms and soles of the feet, the body is not so cold anymore. It's okay to stay underwater for an hour."

Zhang Xu nodded while gnawing on the roasted sweet potatoes.

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

"The water in the lake is not as clean as in the South China Sea. The underwater visibility is very low, and the light is also severely insufficient. It is easy to be attacked." Zhang Xu said as he knocked open the mud outside of a chicken called a chicken. shell.

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

"There is this risk, but apart from that, it can only rely on sound, and I don't think you can learn the dolphins in a short time." Zhang Xu said.

Furong thought for a while, but she could only nod her head.

"Do you have a clue about how to deal with the enemy underwater?" Zhang Xu asked.

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

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

Three times into the water this evening, Furong was so cold.

Although I had been roasting by the campfire for a while just now~www.readwn.com~ and had a warm supper, Zhang Xu still felt that Furong's hands were still very cold.

After walking into the foyer of Hogwarts Castle, Zhang Xu took out the spot map and saw that Harry and Ron were in the prefect's bathroom.

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

The prefect bathroom naturally became the first choice of Cedric and Ron.

Zhang Xu also greeted Filch and told him to ignore the actions of the two warriors.

Therefore, every time Zhang Xu and Furong went to the prefect’s bathroom, he used the spot map to check if there was anyone in it.

Zhang Xu, who planned to let Furong take a hot bath comfortably before going to bed, had to take her to the professor's bathroom.

After more than an hour, Fleur and Scarlett walked out of the professor's bathroom together talking and laughing.

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