Zhang Hao's conjecture may not be correct, and it is difficult for the laboratory to find a way to separate the aura in a short time, but it is relatively simple to capture the aura in the sky.

Fu Yun drove the flying boat, took the Spirit Gathering Array and the Spiritual Qi Collection Device and set off.

The flying boat soared to a height of 20,000 feet like lightning. The aura here is already very thin, and even if Fu Yun tries his best, he can only stay for half an hour.

At this height, the heavy gravity has been revealed, coupled with the thin aura and the power of the spirit stone is not enough to support the flying boat, so Fu Yun still needs to use the true yuan of the Transformation Stage to support it.

And in half an hour, only a pitiful '20 liters' aura was gathered. 'L' is the measurement standard for aura in the Zhangjia Research Base. Under ground pressure, at room temperature, the volume of one liter of aura.

In fact, the amount of aura in one liter is very small, and the aura of a low-grade spirit stone is all released, which is a full cubic meter—a thousand times that of a liter.

And if you want to do the experiment, you need at least 30 cubic meters of aura! The wisp of aura in the previous experiment is more than 30 cubic meters compressed!

And 30 cubic meters is only enough for one experiment!

"I have to lift off 1,500 times......" Fu Yun suddenly felt a little desperate!

In order to collect the 'possible, pure aura' as much as possible, Fu Yun flew all the way to the limit of his ability, and at a height of more than 20,000 zhang, the aura was very thin, and the efficiency of the spirit gathering array was pitiful!

It's like sending an air compressor into space, no matter how powerful it is, it's blind!

Thinking that it would take more than a thousand liftoffs to gather the aura of an experiment, Fu Yun was a little crazy at this time - I know that the Zhang family's secret scientific research is very good, but the research process is also very strange!

Fu Yun landed on the ground and explained the situation.

Zhang Hao smiled embarrassedly, "I didn't expect the efficiency to be so low." Seniors don't have to go anymore, we have another way. ”

"What's the solution?"

Hot air balloons! Zhang Hao pointed to the open experimental base in the distance.

The hot air balloon of the Ocean Group came out at the beginning, and it was a sensation, but soon everyone began to despise it - flashy!

We can fly ourselves, so why fly on such a waste. There are also merchants who want to use it to transport goods, but after experiencing it, they also give up decisively.

Then everyone came to a conclusion: the reason why Dayang Group openly tested this hot air balloon is that this thing is really useless, so people don't care!

With this conclusion, the results are naturally conceivable. And the Ocean Group is conducting hot air balloon research in this way.

Now half a year has passed, and the hot air balloon technology is very mature. And today, it is a milestone test - hydrogen balloons!

With the advent of electricity, the laboratory finally got the electrolysis of hydrogen, and the first element of the periodic table was confirmed.

However, this experiment was not easy, Zhang Hao personally demonstrated the dangerous characteristics of hydrogen - deflagration! When the air and hydrogen are mixed, a violent explosion will occur, and when the amount is sufficient, its power will make Fu Yun change color.

"We're going to take a balloon made of this thing to the sky?" Fu Yun trembled a little at this time. Why is it that with the development of science and technology to the present, there is a rhythm of death?

Zhang Hao shrugged: "Could it be that the seniors have a better idea?"

Fu Yun: ......

Zhang Hao continued: "My idea is to activate the Spirit Gathering Array and directly put it on the balloon and take it into the air. After the Spirit Gathering Array ran for a period of time, the seniors drove the flying boat up to take a look and collect the aura that had been gathered. ”

What's this...... Fu Yun was a little hesitant.

Zhang Hao continued: "Senior, once the immortal qi is successfully studied, you will have countless immortal qi to cultivate. At that time, you may be able to reach the late stage of the Transformation Stage, or even the peak, in a few years.

In the future, there may be a chance to explore the realm above the gods!"

Fu Yun's originally hesitant expression was instantly firm!

The adjustment of the hydrogen balloon took more than ten days, and the first hydrogen balloon was finally lifted off.

The balloon is woven with the best silk of artificially bred silkworms, and the surface is soaked with excellent beeswax to complete the seal. Even so, there is a hydrogen compression tank in the basket to replenish any hydrogen that may have been missed.

The hydrogen balloon is more than 50 meters long and 5 meters in diameter when it unfolds on the ground. The total weight of the lower hanging basket and various items is 800 kg. The main ones are hydrogen tanks, aura replenishment devices (which require manual operation), and spirit gathering arrays.

On the hydrogen balloon, there are two people, both of whom are in the infancy. At high altitude, the aura is thin, the air is also thin, and the living conditions are harsh, and only the foundation of the Yuan Infant Stage can be competent for the work here.

Nowadays, Dayang Group has considerable experience in high-altitude exploration, and knows very well what the high-altitude environment is.

After the hydrogen balloon lifts off, it will stay at a high altitude in principle, and Fu Yun is personally responsible for changing people every day.

The hydrogen balloon slowly lifted into the air, but not many people around it paid attention - no one knew that an unimaginable, super-secret experiment was unfolding right under everyone's noses!

The Art of War: Common is not doubtful!

Fu Yun took a flying boat to protect and follow the flight around the hydrogen balloon. In case the hydrogen balloon explodes, Fu Yun also needs to be responsible for saving people - although those two yuan infants should not be able to fall to death~~

The hydrogen balloon rose slowly, and Fu Yun followed the hydrogen balloon as well.

There is a thin rope woven of heavenly silk hanging under the hydrogen balloon, which is very thin and light, but it is enough to pull the hydrogen balloon! The cost of this rope of heavenly silk is as high as a terrifying million high-grade spirit stones!

People use silk to make hidden weapons and strings, and Dayang Group uses silk to weave a rope of more than 30,000 zhang and hundreds of kilometers!

The celestial silk used has almost emptied the inventory of the entire Fertile Earth Continent.

Of course, no one knows, Zhang Hao looked at the crystal clear silk rope, but he sighed infinitely - if this is the earth, where to find such materials!

A silk rope looks expensive, but technology is priceless! Because of the assistance of these spiritual materials, the technology of the Ocean Group can advance by leaps and bounds - there are very few material difficulties for the time being.

The hydrogen balloon flies higher and higher without any difficulty, and the two people in the gondola are only responsible for inflating the balloon. Of course, the temporary inflation speed should not be too fast.

It was only at this time that Fu Yun finally discovered the advantages of hydrogen balloons.

The airbag began to get bigger, and the folds on it began to disappear little by little, especially the top of the airbag, which became more and more rounded.

It took more than half an hour for the balloon to finally rise to an altitude of about 20,000 feet. At this time, the aura was already visibly thin, and the hideousness of gravity began to be revealed.

The planet's original gravity is ten times that of the earth's surface physical gravity. At this point, the upper end of the hydrogen balloon begins to change significantly.

The balloon began to inflate at an accelerated pace, but the balloon was very slow in height and ascension.

Heavy gravity began to stop people from exploring.

However, Dayang Group had already prepared, the hydrogen balloon began to expand, and after a large amount of hydrogen rushed in, the hydrogen balloon that was still shriveled before began to expand little by little, and the volume expanded by almost one-third, and then the hydrogen balloon continued to rise!

But inside the hanging basket, the faces of the two Yuan Yuan began to change.

High in the sky, the aura is thin - the cultivator's spells and other abilities cannot be used, and they can only rely on the true element in the body and their own physique to resist.

And the high-altitude air is also starting to thin out, and the temperature is beginning to drop, such an environment is not without much danger for the cultivators of the Yuan Infant Stage, but it ...... It's so uncomfortable!

As the hydrogen balloon gradually rose, the surrounding aura became thinner and thinner, and the gravity rose rapidly. But the hydrogen balloon is still rising.

According to the calculations of the scientists of the Ocean Group, it is necessary to stop when the gravity is at 9.8 times the standard – and it is not yet.

9.8 times the standard, almost completely out of the aura layer. And Huang Mingshan and others estimated that the aura here should be the purest.

The hydrogen balloon has risen to an altitude of about 5,000 zhang, that is, about 17 kilometers, and the distance between the balloon and the ground is almost 85 kilometers.

According to the pressure gauge altimeter, the height is 84170 meters!

Looking down from this height, the earth is picturesque, the mountains are like eyebrows, and the white clouds are floating leisurely under your feet.

And Fu Yun could only helplessly stop at an altitude of 67 kilometers, and then had to fall to a height of 50 kilometers to be relieved.

At this time, Fu Yun looked up at the hydrogen balloon in the sky, there was only one small point, only a crystal silk rope connected to the ground, and this rope could only be seen when he got closer.

At this moment, Fu Yun suddenly sighed leisurely: Dayang Group has created another miracle and flew to a height that is beyond the reach of the Transformation Stage. And the Ocean Group seems to be unaware.

But speaking of the height, how can you go up to get the aura and transport people? This seems to be ...... Even if Liu Dingshan is allowed to come, he will not be able to climb to this height!

Fu Yun returned to the ground, and Zhang Hao was also a little stunned...... You can't fly to this height. Then there is no way, Zhang Hao can only let people send binary signals to the sky through the transmission jade disk:

Before dusk, return to the ground.

As for the hydrogen in the balloon, there is no way to recover it for the time being, so it can only be released. The good news is that hydrogen is not a rare resource.

The hydrogen balloon of the Ocean Group has been lifted off for several days, and it has finally attracted a lot of attention. In particular, there are many masters who have come from all over the world around the Dayang Group, and they are very concerned about the Dayang Group.

But it's a pity that the Ocean Group only said to test the hot air balloon...... Yes, it's a hot air balloon! Not a hydrogen balloon!

You're going to really want to get to that height with a hot air balloon...... Unlikely.

But Zhang Hao thought: Even if I tell you 'hydrogen', do you know what it is? So, it's enough to tell you the name of a 'hot air balloon'.

After five days of launching the balloon, 60 cubic meters of aura were finally collected, enough to do two experiments.

But the quest to collect aura doesn't end there, it continues!

And it was also in the evening of this day, when the huge original hydrogen balloon slowly fell from the sky, the envoys from the East, the Kunlun Continent, and the Liang Dynasty appeared.

They finally arrived in Changshan Town...... Well, now it's called Changshan City.

"What's that!" Gundam Shang asked, pointing to the hydrogen balloon in front of him, and asked the locally hired guide.

(If you have something today, it will probably be evening.) ）

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