Chapter 1297, the feeling of being bullied is very warm
Ye Chong stood motionless, as if petrified.
He knew very well that something strange was happening now.
In the past, the general transmission speed of sound in air at 1 standard atmospheric pressure and 15 degrees Celsius was about 340 meters/second.
As of now, the general transmission speed of sound in air at 1 standard atmospheric pressure and 15 degrees Celsius is about 520 meters/second.
The reason why the difference in speed is relatively large is mainly related to the composition of the air, and it is also related to the density.
The air used to contain a lot of oxygen, but the air now is full of spiritual energy. The characteristics and activities of the two are different.
However, the reason why Ye Chong is frowning now is of course not this, but the speed of sound propagation in the vents that he just used his mental power to monitor.
too fast.
Definitely more than 3000 meters/second.
He knew that under normal circumstances, sound propagates much faster in liquids and solids than in air. It even propagates through copper rods and other media, reaching a speed of several kilometers per second, which is normal.
But the question is, are the vents in the cave wall solid?
No.
If there is wind coming from inside, it is a channel for air.
Then here comes the problem.
Why does the sound propagation speed in the air channel exceed the speed of 3000 meters per second, which is almost 6 times that of 1 standard atmosphere and 15 degrees.
What's going on here?
Not to mention the high air pressure in the vent channel.
He can feel it very clearly, which is about 1.2 atmospheres, which is normal.
Not to mention the high temperature in the vent passage.
It's autumn now, and the temperature on the ground is about 15 degrees. The temperature inside the cave should be a little over 18 degrees.
Not to mention the density inside the vent.
They are all interconnected air, and their densities are not much different.
There's also humidity.
The inside of the cave is pretty much the same as the outside.
normal status.
So, here comes the problem.
It is true that there is a difference in the air inside and outside the vent.
But is this a big difference?
Not big.
Very little.
Reflected in the impact on the speed of sound propagation, it is not worth mentioning at all and can almost be ignored.
However, what is the result?
The sound propagation speed in the vent channel definitely exceeds 3000 meters per second, which is 6 times that outside the vent channel.
There is no doubt that this phenomenon will certainly make Ye Chong anxious and frowning.
"I estimated it using my mental strength.
This is indeed less accurate than using an instrument to measure speed.
However, it's definitely not that bad.
So what's the problem now?
Isn’t there air in the vent passage?
fallacy.
If it is air, why does the speed of sound become so fast?
besides.
I have knocked on the cave wall at the vent. It is ordinary earth and stone, and the sound does not travel very fast.
The key point is that their laughter is not tapping, so it really has nothing to do with the things on the cave wall.
All right.
That is how the matter?
Could it be that he has seen a ghost?"
When Ye Chong thought of this, he couldn't help but subconsciously look back. What he saw was an indescribable scene, which frightened him.
Liang Xiaomiao and Fan Xiaobing all stopped what they were doing and looked at him blankly.
"Why don't you scream?" Ye Chong was a little confused.
"What's it called?" Liang Xiaomiao and Fan Xiaobing were both stunned.
"I saw you guys changing clothes...don't you need to shout?" Ye Chong murmured.
"Haha." Both girls had a half-smiling look on their faces.
Ye Chong couldn't help but smiled bitterly and shook his head, then turned around again.
It was at this time.
A muffled cry suddenly sounded from the cave.
There seems to be...
Roar?
Whoa!
Ye Chong couldn't help but turn around, looked at Liang Xiaomiao and Fan Xiaobing and said, "Who shouted?"
"Hehe," Liang Xiaomiao covered her mouth and laughed, "Uncle, isn't it enough for you to watch it once? Are you teasing me?"
"Yes, uncle, I didn't expect that your ventriloquism skills are good," Fan Xiaobing grinned, "It would be a pity not to talk about cross talk."
Ye Chong looked solemn and said, "You didn't say anything just now?"
Seeing each other's solemn expressions, the two girls couldn't help but shake their heads.
Whoosh!
Ye Chong turned around, narrowed his eyes, and looked quietly at the wall of the vent again.
There are only three of them in the cave now.
He said he didn't say anything, so of course he knew.
Liang Xiaomiao and Fan Xiaobing didn't talk, they just didn't talk. It's impossible that they couldn't tell their priorities and had nothing to do to lie to him.
So, since none of the three people in the cave spoke, where did the sound just come from?
Is there really a ghost?
When he thought of this, Ye Chong couldn't help but shudder.
Ahhh!
Before Ye Chong could completely lose his temper, two girls, Liang Xiaomiao and Fan Xiaobing, screamed and rushed towards him.
As a result, he didn't even have time to react before they all hugged him tightly.
The key is that there seems to be only his clothes between him and them...
Teng!
An inexplicable anger surged.
Scholars can be killed but not humiliated.
It's so bullying.
It was at this time.
Whoa!
Liang Saihua got in from the outside, and when she saw the scene in front of her, her face turned red and her lips trembled.
"Hua, they bullied me..." Ye Chong was extremely embarrassed now, neither pushing nor pulling, "You come too, it's just three against one."
"Huh! You're such a shameless disciple." Liang Saihua half-turned around and shouted, "You two quickly put on your clothes and come out with me."
"Hua, are you letting them out at this time to attract animals?" Ye Chong gently pushed outwards with his left and right hands, "You should still be on duty outside.
Let them practice at the bottom of the V-shaped channel.
If there is a situation, it is better to pass the information through their exchanges."
"Sister, there is a ghost here." Liang Xiaomiao shouted.
"Yes," Fan Xiaobing continued, "There were voices here just now."
"How old are you, and you are so surprised?" Liang Saihua said angrily, "Come out quickly, don't affect his work."
"Hua," Ye Chong said with a smile, "How about you come and change your clothes? They almost stink."
"Hmph!" Liang Saihua gave the other party a fierce look, "You are not allowed to call me Hua in the future."
Cack!
Liang Xiaomiao and Fan Xiaobing laughed at the same time.
There is no doubt that it can be seen from their smiles that they are afraid of a woolly ghost?
What just happened was clearly a planned crime.
"Okay," Ye Chong put his hands on his body, "I'll change first."
Ahhh!
As soon as these words came out, Liang Saihua, Liang Xiaomiao and Fan Xiaobing immediately ran away, and each one escaped faster than the other.
But Fan Xiaobing looked back and smiled, filled with an intriguing flavor that made people feel a little itchy.
Ye Chong couldn't help but smiled bitterly and shook his head.
Speaking of which, if we don't drive them away in this way, we don't know how long it will be delayed?
Soon, he stood by the vent passage again, staring at the gap in the cave wall with a solemn expression.
There is no doubt that the sound just now came from the vent.
It felt like answering a phone call without turning on the speakerphone, and then picking up the sound heard half a meter away.