뉴스가 한 줄로 흘린 장영실함의 진짜 과학, 안 찌그러지고 안 터지고 안 들키는 이유

Sr. simply passed by the news with a single line: "Launch of the 3,600-ton Jang Yeong-sil." However, hidden behind that single line were three branches of science. Why it doesn't crumble when 250 Grandeur cars press down on it from all sides; why batteries capable of reaching 1,000 degrees in just five seconds were deliberately placed in a submarine carrying only 50 people; and why the enemy cannot locate this massive hunk of metal even at its very nose. If you follow these three questions, you will see that it is not steel that truly protects the submarine. You will also realize that this "undetectable technology" is the root of the deterrent that safeguards the entire nation. The physics of pressure, the chemistry of batteries, and acoustics that silence sound—I will explain these three branches of science using everyday analogies. If you watch until the end, you will understand why a nation that started by learning technology from Germany is now standing face-to-face with that very mentor in the final round of the 60 trillion won submarine contract with Canada. Chapter 00:00 Crushed by 250 Grandeurs and Still Fine? 01:20 What Is Pressure — Pascal's Principle 03:10 Three Secrets to Not Crushing (Materials, Shape, Welding) 06:30 1,000 Degrees in 5 Seconds — Why We Went Out to Put in Lithium Batteries 08:50 Thermal Runaway: A Fire Burning While Carrying Its Own Oxygen 11:00 Design That Contained, Not Eliminated, Danger 12:20 The Battle of Sound — How to Destroy the Enemy's Ears 14:10 The Art of Not Being Detected Is the Root of Deterrence 16:00 From Chaser to Leader — Canada Group 60 Finals