In 1799, at the age of 21, the "little chemist" David was working at Dr. Thomas Belz's Institute of Medical Gases. He was studying whether gases could be used in medicine. The first gas David worked on was nitrous oxide, which he quickly produced by reacting nitric acid with a metal and putting the nitrous oxide in a cylinder.
One day, Belz came to the lab and was delighted to see that David had made so many bottles of nitrous oxide gas: "Well done, lad!" But, as soon as he turned around, he accidentally broke a gas collection bottle containing nitrous oxide gas with his hand. The glass shards cut his fingertips.
"It's not serious, is it? Mr. Belz." David asked hastily.
"Never mind! You see ...... hahahahaha ......" Belz laughed loudly before he could finish his sentence, "hahahahaha . . you see, my fingertips don't hurt at all, it's just that the glass bottle was touched and broken, hahahahaha ......"
"hahahahaha ...... " David, who had just been alarmed by Dr. Beltz's perverse expression, couldn't help but burst out laughing at this point.
After a bout of maniacal laughter, Davey realized that it was nitrous oxide that was responsible for all of this just now.
David went to the hospital to extract a tooth, there was no anesthesia, the doctor pulled out the tooth, the pain David sweating, he rushed to the laboratory, took out a bottle of nitrous oxide gas, and even inhaled a few mouthfuls, and, sure enough, his teeth did not hurt, but then laughed a lot.
After many experiments, nitrous oxide was gradually used as an anesthetic by surgeons to relieve the pain of patients undergoing surgery, and the ear-piercing shouts disappeared, and all you could hear was laughter.
Later, nitrous oxide was commonly known as laughing gas.
I hope I can help you to solve your doubts.