Teaching is not simply indoctrination of knowledge, but more importantly, it is to cultivate students' ability to analyze and summarize, and use knowledge to solve problems.

In Martin's opinion, it is a great progress for his three students to see things floating and rising in the water and be able to take the initiative to think.

"We have just talked about the concept of density. In fact, the floating and sinking of this object is related to density!"

"Generally speaking, if the density is greater than water, it will sink in the water, and if the density is less than water, it will float up."

Martin said as he pulled out the gold bars and wood from the water tank.

As for the others, he ignored them for the time being.

Because the appearance of gold bars and wood is relatively similar, it is easier to make further comparisons.

"So, even if the large wood is smaller than water, it can float."

He raised the two items in his hand.

Clinn suddenly realized and widened her eyes and said, "Teacher, this is why those big ships can float on the water?"

Gress frowned and shook her head: "No! Some ships can still be equipped with steel, so why won't they sink? Does it have anything to do with the shape of the ship?"

After all, age and experience are there, and he thinks more deeply.

Faraline is a port city with a very developed shipping industry and a variety of ships.

Especially in recent years, giant ships using steel on a large scale have appeared.

"What you said is not accurate enough. In fact, as long as you find a method, gold can also float on the water."

Martin smiled, and then began to press the gold bars hard.

As an extraordinary person, physical fitness has been enhanced.

Gold is softer, so he thought he should easily pinch gold into various shapes.

The result is... a little embarrassed.

He tried his best, and the gold bars only turned a little more.

Clint was holding back his laughter, and Rocky next to him looked at him curiously, his innocent eyes made Martin's face turn red.

"For the convenience of storage and transportation, a certain amount of platinum is added to the gold bar, so the hardness is very high."

Clinn explained with a smile, but there was a hint of crampyness in her eyes.

Making a fool!

"I'll do it, what shape does Mr. Martin want to turn it into?"

Gress picked up the gold bars with a very sincere look.

Martin then remembered that the older student had a much higher sequence than himself and should have been much stronger.

"Just pinch it into thinner gold pieces."

Martin smiled slightly, unwilling to show an embarrassing embarrassment.

However, the next scene stunned him.

Gress didn't pinch it at all, but simply placed the gold nuggets on the table and covered the gold bars with her palms.

After the gold bar touched his hand, it spread out on its own as if it had turned into liquid.

Soon, under the pressure of an invisible force, it turned into a thin sheet.

Moreover, the shape is very regular, as if it was poured out by a mold.

A rectangle has a similar length and width ratio to the original gold bar.

Martin clearly felt the fluctuation of extraordinary power and immediately realized that this should be the ability of the craftsman sequence.

Of course it doesn't matter if he is an extraordinary person to see the scene in front of him, but there are two children next to him...

Martin's eyes turned to his side, but found that Clin and Rocky did not have too surprised expressions, as if they had seen similar situations long ago.

Martin sighed secretly, realizing that he was overly worried.

Count Cross is also an extraordinary person, and is most likely a craftsman sequence.

They have grown up, so they should be used to it.

Martin took the keyboard-sized gold piece and easily pinched it into the shape of a canoe.

Put the golden small canoe into the water tank, and it sinks slightly, but it still floats steadily on the water.

Clin and Rocky both widened their eyes in surprise and looked at the scene in disbelief.

In fact, the world has long existed on buoyancy.

However, this kind of research has been circulating among shipbuilding craftsmen, but it has not spread out.

Two wealthy children who rarely go out, and a nerdy middle-level cadre in the temple certainly don’t understand these.

Martin took another gold bar, put it in the water, and sank it directly.

"These two pieces of gold weigh two pounds, but now this piece can float on the water. Think about it, what changes have happened?"

Martin asked in the heuristic tone of a qualified teacher.

"Shape?" Clin said immediately.

“Inaccurate enough!”

Martin smiled: "Gold can be pinched into various shapes, but why can only ship-shaped ones float? Then can other shapes float?"

Gress seemed more cautious, and observed it repeatedly on the edge of the water tank for a while, then said, "It's the volume immersed in the water that has changed. No wonder those water hands say that the water volume is spreading!"

Martin raised his eyebrows.

This guy should be considered a top student!

Without saying anything, he directly added a small weight to the small canoe, and the boat sank again with the naked eye.

Then a classic physics summary is given.

"The deeper the sinking, the more water discharge, and the greater the buoyancy is received. The buoyancy offsets the gravity, so it can float on the water."

Gress looked at the canoe in the water tank and suddenly raised her head and stared at Martin with her eyes, saying in surprise: "Wouldn't it be possible to build a ship with iron? This way, it can be made bigger and resist a more fierce storm!"

It is worthy of being a craftsman sequence and is very good at grasping key points!

Martin nodded: "It's theoretically. However, if you use metal, the boat's own weight will increase and the planting weight will decrease, and the speed will slow down. Unless it has a power that is far beyond the sail, it will not be worth the loss."

After seeing Gress's ability, Martin suddenly remembered another thing and couldn't help asking: "Mr. Gress, is your ability useful to all materials?"

Gress shook her head: "Not all materials are OK, such as wood and stone."

"In fact, only metal and a small number of materials can be used to shape, which is too practical."

Shaping...

It seems that it is Glace's own definition of ability.

Moreover, looking at his expression and tone, he seemed to be a little disgusted with this ability.

But Martin knew that this ability might hide great potential!

The key lies in the principle of shaping this ability, and the degree of control of this ability by the extraordinary craftsman sequence.

Martin really wanted to complain, he was really crying for poverty while guarding a huge gold mine.

He didn't care about continuing the lecture, and handed the gold bar to Gress and said, "Can you make a perfect sphere?"

"Perfect sphere? Let me give it a try."
Chapter completed!