# Vacuum Physics?

1. Jan 20, 2010

### slworry

Vacuum Physics???

I would like some clarity on a problem I think is attributed to a vacuum space. This is what happened...I have a small room that is 7' x 10', there are two metal doors directly across from each other on opposites sides of the room. It seems that when I want to close the door fast the air within keeps the door from closing but I can close it if I do it slowly. My problem is that my daughter slammed the door with significant force and it did close, however there are double pane windows in that room as well and one of the windows now has a crack in it (the inside side of the double pane glass---inside the room). Could the vacuum force when she slammed the door caused the glass to crack?

2. Jan 20, 2010

### stewartcs

Re: Vacuum Physics???

A vacuum doesn't exert a force on anything.

I presume the door opens outward? If so then it sounds more like air is being drawn/forced into the room by the closing door and thus creating an overpressure in the space.

CS

3. Jan 20, 2010

### vin300

Re: Vacuum Physics???

from my POV, that's quite a silly prediction, there's air in the room , the air pressure does not seem sufficient to break the panes though(the one who designed the room must know, decrease in the area of the pane and increase in the area of the room decreases the force on the pane), the force of the slammed door propogated through the walls

Last edited: Jan 20, 2010
4. Jan 20, 2010

### stewartcs

Re: Vacuum Physics???

The door slamming could certainly also cause the problem...but I imagine that the door would have to be slammed really hard to crack a pane of glass. I suppose it would help to know the composition of the room (e.g. walls, windows, doors).

CS

5. Jan 20, 2010

### stewartcs

Re: Vacuum Physics???

The air in the room is at atmospheric pressure, the air outside of the room is as well. If the pressure inside the room is increased enough, then the unbalanced air pressure on the inside could certainly crack the pane of glass. Hence, it's not that silly.

CS

6. Jan 20, 2010

### vin300

Re: Vacuum Physics???

My post was addressed to the OP. When I was doing it, there wasn't yours

7. Jan 20, 2010