After eating the jellyfish meat, Li Yan quickly went into the wooden house to sleep.

After all, it's been a tiring day.

Especially in the afternoon, after swimming back and forth at sea so many times, the physical exertion is of course very serious.

Slept through the night.

Day 5.

Li Yan got up early, stretched his waist, and walked out of the wooden house.

As soon as he met him, the bun immediately pounced, hugged his legs, and gnawed vigorously.

Now, almost half a month has passed, and the bun has grown to a size of more than 70 centimeters, and it looks like it is about to catch up with the small skin.

And on its back, it has also begun to grow all kinds of rough crust, as well as the hard bones on its head, which are also small in scale, and in terms of defense, they have begun to take shape.

Maybe the Shinjuku camp is too small, and the buns can't bear the loneliness.

Unable to stand the little guy's entanglement, Li Yan arranged for it to join the search team, and together with the pangolin and Buu, they searched for rare plants in the jungle near the campsite.

Frolicked for a while.

Li Yan opened the bun and came to the catalytic room.

As soon as the door is opened.

Ooh!

A foul smell immediately hit my nose.

Fortunately, he hadn't eaten yet, so he could only retching by the door, or else he would have to vomit out all the things he had just eaten.

"No, next time it's best to use herbivore feces as much as possible, this carnivore feces are just like people, they stink!"

It's like the difference between cow dung and dog shit.

Plant manure, after all, the taste is still smaller.

Li Yan shook his head, went out for a spin, took a piece of water-soaked thatched cloth, covered his mouth and nose, and then returned to the catalytic house again.

Saw.

There were five or six catalytic boxes inside, all of which were covered with a layer of faint hoarfrost crystals, especially the first box he made the day before yesterday, which was already covered with a thick layer.

"I guess it's almost ......"

Li Yan nodded, took out the box of catalyzed soil nitrate, put it on the open ground, and then used the woodworking table to make a thin wooden board, and gently scraped out the white crystals from the box.

Maybe it's because the dinosaur feces are fermented strongly; Perhaps the plants of the origin world contain more organic matter; Perhaps it was the Origin Energy that helped.

In a word.

He got a lot of earth nitrate, and according to the amount of alchemy units required, he got four copies!

The material is back flushed.

Li Yan immediately couldn't hold back the excitement in his heart.

That's right, he's going to start making black powder!

Immediately, he hurriedly took out the charcoal and sulfur that had been made in the refining furnace before, piled them together with the earth and nitrate, and placed them on a huge fern leaf.

Then, with his left hand, he pressed these alchemy materials together, and his mind moved.

Blue light flashes.

The material began to be constantly broken down and disappeared.

There was a delay of about three to five seconds, and when the blue light dissipated, two piles of black particle powder appeared on the leaves, which were black powder!

Li Yan pinched it with his fingers, compared with the modern silver gunpowder, the black powder in front of him was obviously rougher and very grainy, but the fusion of charcoal, sulfur, and earth nitrate was very uniform.

This is one of the reasons why he uses the system to synthesize black powder instead of making it himself.

As we all know, when I was in high school chemistry, my teacher said that the formula ratio of black powder is "one nitrate, two sulfur and three charcoal".

But in reality, the ratio of this formula can be changed over time.

Different proportions determine the different deflagration properties of black powder, which needs to be carefully calculated.

Otherwise, when you ignite it, you can't predict its deflagration time and power, and it is easy to cause accidental injury.

The black powder blueprint of the system has a fixed synthesis formula, and the proportion of unified planning will not be wrong, and it will naturally be easier to grasp.

Subsequently.

Li Yan separated the two parts of gunpowder, and one of them was evenly scattered on the ground, connecting them into a lead nearly three meters long.

The other part was put away, a piece of bamboo was found, and a sealed bamboo tube three fingers thick and nearly twenty centimeters high was broken out with a carpentry table, and then a one-handed sword was used to pierce a hole at one end, and black powder was poured into the hole.

That's right.

He was going to test it in two parts, one to test the flammability of black powder and the other to test the detonation of black powder.

Then, Li Yan took a piece of burning charcoal from the fire, pointed it at the black powder lead in the clearing, and lit it.

The next moment.

Just listen to the "snort".

Several sparks sputtered out at once, and the black powder instantly began to burn, and continued to move along the lead.

And as it burns, a large amount of black smoke comes out.

Li Yan has been staring at its burning speed, which is obviously much slower than modern smokeless gunpowder, but much faster than the "turtle speed" black powder in ancient film and television dramas in his impression.

The lead wire, which was close to three meters long, burned out in about a second or so.

He is still quite satisfied with this burning speed.

Next, it was time for him to test the power of the explosion, which he was most looking forward to.

"Try Lao Tzu's second kick!"

Li Yan grinned, laughed, found a few wild grasses, dipped a large amount of black powder powder, and then twisted them together, along the holes in the bamboo tube, and stuffed them into the gunpowder.

Compared to pure black gunpowder.

The weed fuse mixed with gunpowder burned much more slowly.

There was a delay of about two or three seconds.

I saw an explosion on the ground, accompanied by a dazzling white light, like a firecracker on the earth.

Immediately after, a large amount of smoke came out.

Li Yan stood ten meters away from the explosion point, watching many tree branches scattered in all directions, and even almost collapsed by a tree branch.

"This explosion is not bad!"

Before the smoke completely cleared, he couldn't wait to run to the scene of the explosion, and he could still feel the residual heat of the explosion.

The maximum heat release per kilogram of black powder can reach at least more than 34,000 joules, and the instantaneous temperature can exceed 1,200 degrees Celsius, which is very terrifying!

Sweep away the smoke.

Li Yan saw that the bushes under his feet before had now become unrecognizable, and all the branches in the center had been blown out, and even the branches next to them had been blown off one by one and burned to black.

There is a relatively obvious mark of the impact of the explosion on the ground.

He estimated that this power was enough to blow off one of a human hand.

And in the bamboo tube, there was only less than half a catty of black powder.

According to this data, a black powder the size of a wooden box can completely blow up a small and medium-sized dinosaur of about four meters into serious injuries, or even kill them on the spot!