Shiyue didn't understand.

Ji Tianxin looked at the tree outside the house.

Shi understood now, and immediately spit out a thunderbolt from his mouth.

With a loud rumbling sound, the tree was instantly electrocuted into charcoal.

Ji Tianxin nodded, "Hmm......"

She turned and walked back, walked over to her desk, picked up the charcoal she had made earlier, and began to write a series of equations on a blank piece of paper.

It's like calculating something.

Shiyue and Hua Ling glanced at each other and ran over, but they didn't understand what the master wrote.

It's all weird characters.

Ji Tianxin also thought for a while when she picked up the pen, the memory was so far away that she almost forgot it before she took it.

After this rebirth, the memory of the previous life gradually became clear again.

Although I didn't know what the master was writing, they didn't bother when they saw her serious look.

Finally, after the calculation was completed, Ji Tianxin stopped the ink pen in his hand.

Looking at the results of his own calculations in the end, "In this case, the power should be enough." ”

Eclipse Moon and Flower Feather looked at each other.

"Master, what do you want to do?" Shiyue curiously came up to take a look.

Ji Tianxin looked at the dripping rain outside, and said lightly: "Do some, gadgets." ”

Shiyue became interested when she heard it, "Is it fun?" ”

Ji Tianxin's lips were lightly pulled, "It's fun." ”

"Hua Ling, go collect some water." Ji Tianxin commanded.

Hua Ling nodded and immediately went down to do it.

So in the past two days, Ji Tianxin has been in retreat for two more days, and no one can disturb him, but he has let Shiyue stay with him.

This all made Su Qing and Hua Ling a little confused.

Xu Fan and the others also came to find the sect master a few times, but they didn't bother when they learned that the sect master was in retreat, and continued to be busy cultivating the Heavenly Gate.

Shiyue stared curiously at the strange equipment in front of him, which was a simple tool that the owner had set up casually.

There are pipes and grooves for draining water, and I can't see what it is after looking at it for a long time.

But the owner let him discharge electricity from time to time, and even the time and energy of the discharge are required.

He almost couldn't even put the electricity off.

"Master, what are you doing here?" Ezuki flicked her tail and stared at what she had just collected in the container.

"Electrolysis of water, hydrogen production." Ji Tianxin said slowly.

Eclipse Moon was puzzled, "What is that?" ”

Ji Tianxin continued to be busy with the movements in his hands, and explained simply, "Electrolysis of water can separate hydrogen and oxygen. ”

Shiyue still doesn't understand, anyway, it's just asking, as a beast without any desire to learn, if it can't figure it out, it doesn't want to.

"And a certain concentration of hydrogen, in the air, will explode." She spoke again.

She remembers that a certain concentration of hydrogen gas, ignited by heat in the air, can explode.

Hydrogen combines with oxygen in the air to form water.

In the process of generating water, heat is generated.

Therefore, a certain concentration of hydrogen will detonate in the air.

She also thought of it on a whim.

Perhaps, it is possible to make a little simple "small bomb", which will be convenient for fighting later.

It can also be given to Su Qing for their self-defense.

Fortunately, she still remembers the equation for calculating the amount of electricity required, and she still remembers the principle.

"What do you mean, master, this thing can explode?" I understand this.

Ji Tianxin packed the collected hydrogen into a small round ball in a vacuum.

Although it looks like a small ball the size of half a hand, the hydrogen concentration inside is extremely high.

"Go try." She handed a small round ball in her hand to Shiyue, and the corners of her lips hooked slightly. Take a hundred plating, and read the latest chapter of "The Princess is so fierce that she spoils the Paw Book House" for free for the first time.