Recent content by tullyNic

... well... we can just assume it to be a orthoprism with length of 100m . and emmm at north pole. BTW, can you tell me why the altitude matters in this case ? Thank you.~

Assume a rigid building(assume the building to be like a pyramid and its empty inside) to be vacuum. If we open a hole(about r=.5m), then, how long will it take for the air to take up of the whole space apprximately? Will, it's just curiosity because I found a little pump in a class room...