Key point?

Song Qing's brain was working rapidly, analyzing the previous failed attempts and the success of this one.

The previous steps remained the same, but the real change should be the last step: thunder strike!

What is different about this thunder strike compared to the last one?

Several faint electric arcs flashed through his mind, and Song Qing's body shook as he exclaimed excitedly, "I understand, I understand!"

"Xu Ningyan, you are truly a genius alchemist."

"Although you haven't seen our previous failures, you already knew the real reason for our failure, didn't you?"

"No, I only know that your thinking has gradually degenerated..." Xu Qi'an laughed without saying a word.

"What is the key point? Song Shixiong, do you understand?"

"Song Shixiong, don't keep us guessing, hurry up and tell us, this alchemy is almost becoming my inner demon." The white-robed alchemists were anxious and kept asking.

Song Qing coughed and looked around at his younger brothers before saying in a deep voice, "It's the intensity of the thunder strike."

After saying that, he looked at Xu Qi'an with a questioning gaze.

Xu Qi'an nodded with a smile and said, "I named it voltage."

The voltage for making sodium metal must be controlled between 6-15 volts.

Voltage?!

Song Qing was stunned, another term he had never heard of. He knew about electricity, but what was voltage?

Instinctively, he felt that this was a great point of knowledge, just like the essence of everything written in that blue book.

A white-robed alchemist stepped forward and bowed to Xu Qi'an, "Please explain, what is voltage?"

"Please teach us." The other white-robed alchemists also bowed and asked in unison.

Chu Caiwei, who was standing on the side, was envious. She loved the feeling of being a teacher and instructing her disciples. Unfortunately, she was only a feng shui master and didn't have the qualifications to teach disciples.

"Voltage, also known as electric potential difference or electromotive force, is a physical quantity that measures the energy difference produced by the different electric potentials of a unit charge in an electrostatic field... Of course, what I just said, you all won't understand." Xu Qi'an coughed and said seriously, "Electricity is like water flow, it flows towards the lower point."

Xu Qi'an lifted his teacup and poured the water out, "This cup pouring on anyone won't cause any harm, but if it's a waterfall and a person is in it, the force of the water will break their bones, and even cause death. Electricity is the same, and I call this phenomenon voltage."

He used this easy-to-understand example to explain voltage.

The white-robed alchemists of the Sitian Observatory frowned and fell into contemplation. Although they were alchemists who could manipulate thunder and lightning, it didn't mean they understood the nature of electricity.

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Suddenly, Song Qing understood something and exclaimed, "So, when it rains, lightning strikes trees because they are in a lower position? It's the same reason why people get struck. In addition, if it's only a weak current, we will only feel numbness, but if we are hit by a thunderbolt, we will die."

"The truth is that the voltage of a thunderbolt is so powerful that it exceeds the limit that ordinary people can bear, just like a waterfall. And a weak current is like a cup of water, which can be tolerated."

Hearing Song Qing's words, the white-robed alchemists suddenly became enlightened and had the feeling of gaining the truth, and they looked at Xu Qi'an with questioning eyes.

Hmm, is this the principle? Isn't the reason why trees are struck by lightning due to the conductivity of rainwater? My high school teacher didn't explain it clearly... Xu Qi'an wasn't sure himself and smiled, "Teach the young ones.""Is this also written in that alchemy manual?" asked a young man in white, his face full of curiosity.

"Yes, that alchemy manual has only been read and studied by me. I had someone send the contents from the notes of the Bureau of Astrology, but it's just a drop in the ocean," Xu Qi'an paused and spoke solemnly, "That ancient alchemy text not only contains knowledge, but also many unheard of alchemy techniques."

Unheard of alchemy techniques...everyone present breathed a little heavier.

Xu Qi'an smiled and made a promise that made the white-robed scholars boil with excitement, "I have decided to share the alchemy manual with the Bureau of Astrology."

Wow!

Nearly twenty alchemists were instantly excited and thrilled.

"The blue book I gave to the Bureau of Astrology was my thank you gift for saving me. I taught you how to perfect the fake silver refining technique and the voltage knowledge I just taught you, but it's not free," Xu Qi'an said confidently, "Of course, it also includes the follow-up alchemy manual."

"Never forget, the principle of alchemy is equivalent exchange!"

Song Qing nodded in agreement with Xu Ningyan's words and asked on behalf of his younger brothers, "How much silver do you want?"

"Crude!" Xu Qi'an said sternly, "Alchemy cannot be measured by silver."

What is free is the most expensive...he silently added in his heart.

......

County government office, side hall.

Xu Lingyue held her sleeping little sister in her arms, clutching her handkerchief and crying.

Looking at the pear blossom-like little beauty with tears in her eyes, the fast-handed men's hearts were about to break. They never expected that Xu Ningyan would have such a beautiful and charming sister.

Even the king's catcher at the brothel was stunned by the little beauty.

The atmosphere in the side hall was a bit depressing, and the fast-handed men had ugly faces and were listless.

The king's catcher poured a cup of tea and placed it in front of Xu Lingyue. After crying for a long time, the little beauty's tears had not stopped. Women were indeed made of water.

"Miss Xu, don't worry, the hundred households will find a way to save Ningyan," the other fast-handed men comforted her and cursed Zhou Gongzi.

The relationship between the eldest brother and his colleagues was very good...Xu Lingyue was a little surprised, and the angry expressions of the fast-handed men did not seem fake.

As if sensing her surprise, the king's catcher smiled, "Ningyan is a person worthy of respect."

Respect? Xu Lingyue was stunned, choked up, and whispered, "King's catcher, can you tell me about my big brother?"

The king's catcher was silent for a moment and unconsciously lowered his voice, "Actually, for people like us, where is there anything clean in our hands?"

"It's not that ordinary hundred households don't have a conscience. As for those wealthy merchants, it's not natural to take advantage of them," he continued, "But your big brother never extorts or blackmails anyone, whether they are commoners or wealthy merchants. Recently, considering the difficulties your family has encountered, I decided to take him to make some money..." The king's catcher said here, his expression was strange, with embarrassment, admiration, and respect, "He smiled and agreed, and afterwards, I gave him five taels of silver, but he secretly returned it to the other party."

"If you say he is sensible, doesn't he understand the principle that clear water has no fish? But if you say he is not sensible, but very good at handling things, and gets along well with everyone, he's very slippery. So when he got into trouble, everyone felt uncomfortable."

Xu Lingyue listened intently, and the image of her big brother in her mind became tall, bright, and towering.

She had always admired Xu Xinnian since she was a child because all things under heaven are inferior to reading. Her mother always instilled in her that her second brother is the only seedling of the Xu family and the future pillar of the family.This worshipful emotion reached its peak during the autumn imperial examination this year, when Xu Xinnian became a juren.

But with the subsequent tax and silver case, the whole family was imprisoned and felt hopeless. It was the eldest brother who opened up a way out for the family in dire straits.

Xu Lingyue shifted her attention back to her eldest brother, feeling a little curious about him.

It wasn't until today that she realized how reliable her eldest brother was, just like a month ago when he rescued them from prison in their despair.

But at that time, the feeling was certainly not as profound as it is now.

When she saw her brother save her sister in that moment, Xu Lingyue felt that her brother's image was equal to that of her second brother, whom she had always admired.

At this moment, upon hearing the lament of Wang the catcher, an image of someone with high integrity, principles, and bottom line emerged, surpassing the second brother whom she had always admired.

At this time, the light and shadow at the door of the side hall changed, and Xu Pingzhi and his son finally returned to the Changle County yamen and saw their safe and sound sister (daughter). The father and son were relieved.

Xu Lingyue looked up, tears streaming down her face, and mournfully said, "Dad, you have to save big brother. If he can't come back, your daughter won't live either."