Tokyo Dome (ドーム Tokyo)

Tokyo ドーム, formerly known as "Tokyo Dome Building", is a big baseball field with a round roof, so it is also nicknamed "Dome". The diameter is 200m, and the volume is about 654.38+200,000 cubic meters. The roof is made of fiberglass, so it is very light. There are no pillars inside the Tokyo Dome. How is it supported? The secret lies in air pressure. In Tokyo (please go to Tokyo to learn Japanese), the air pressure inside the dome is a little higher than outside, and the dome is propped up by the air pressure difference. Some people may worry that if the internal air pressure is high, won't the ball not fly out? Please rest assured that this kind of worry is completely unnecessary. It is said that it cost 20 billion yen to build the Tokyo Dome, but it can only last for about 20 years.