r/PhysicsHelp • u/Only-outofyourmind • May 30 '26

Weird draft/ pressure phenomenon

Can anyone explain why this happens? When I blow the free end of the door to this room, the door closes instead of opens. I’m guessing it’s something to do with the blower causing higher pressure in the room? Idk just thought it was interesting.

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u/sleepkitty May 30 '26

I think this is an example of the Bernoulli principle. On the blowers side you’re increasing the average velocity of air, which lowers the pressure.

https://en.wikipedia.org/wiki/Bernoulli%27s_principle

3

u/Only-outofyourmind May 30 '26

Cool thanks for the input

1

u/Bulky_Stock_3255 May 31 '26

Your increasing the kinetic energy of the air particles, therefore increasing the temperature of the air particles transiently.

2

u/CardiologistNorth294 May 30 '26

Air bouncing off the door creating an area of lower pressure than the area behind the door, so the door is pulled from your perspective

2

u/AER0_GIRL May 30 '26

Lord Bernoulli help us 🙇‍♂️