Recently, a foreign physics teacher demonstrated Bernoulli's law to netizens with a small experiment** The experimental results are not only shocking, but also netizens have found that their way of using electric fans has always been wrong. The teacher used a yellow bag in the video. He blew hard at the plastic bag with his mouth, but it didn't blow up. After that, I tried to blow for ten breaths, and then I blew less than half.
Later, the teacher didn't stick his mouth directly to the opening of the plastic bag, but there was a certain distance from the opening. He blew up the whole plastic bag in one breath.
This is based on Bernoulli's law. When blowing, the surrounding air will also flow into the low-pressure area
Finally, the teacher said that this principle can also be used in life. For example, on a muggy summer night, what if you don't have an air conditioner?
You can blow the electric fan against the open window. Be careful to pull the fan back a little** In this way, the electric fan can blow the hot air out of the room and cool the room.
After that, some bloggers did experiments carefully. The final results showed that when the fan is 0.5m to 2.1m away from the window, the indoor ventilation effect is the best** After watching the video, some netizens found that they had been using the wrong fan. Netizens went home to try this new method and found that it really worked.
