Originally Posted by Taeric
That would be absolutely true...if the case had absolutely no strength, i.e. a case made out of paper. Steel and aluminum cases could resist a fair amount of pressure before flying apart, though as has been said, the vast majority of cases are not air tight, which keeps pressure differences minimal.
HVAC designers often plan on having positive or negative pressure in the buildings, and those building do not explode or implode. If you ever enter a building (office buildings are notorious for this) and it takes almost no force to open the door, it's likely because the building is slightly pressurized. While the pressure is not enough to blow the door open (though I've seen this recently - a nearby building had it's doors open 8-10 inches simply from the building pressure), it is enough to "lighten" the force necessary to open them.
I know in some buildings, the doors will whistle and hum from the air rushing past the little openings. If you open the doors, its like being in a wind tunnel. You walk outside.....cool and calm.
Has anyone ever walked up a subway tunnel? Warm, stagnant air downstairs, but as you walk up, man what a breeze! You get up and out, and hey, its not windy!
I'm a physics dork....