"Insulating glass (IG), more commonly known as double glazing (or double-pane, and increasingly triple glazing[1]/pane), consists of two or three glass window panes separated by a vacuum or gas filled space to reduce heat transfer across a part of the building envelope."
I was working near another engineer once who was attempting to arrange flow of dry nitrogen through a plastic cabinet which was in the shape of a cube, one foot on each side.
He had a regulator between the nitrogen source and the cabinet and a pressure gauge monitoring pressure in the box.
As I was watching he had the access door to the cabinet closed and was cranking up the pressure. I think the gauge read about 10 psi. Since each face of the cubic box was 144 square inches I was able to quickly approximate that the pressure on each face must be 10 times 144 or about 1500 pounds. That's right. About three quarters of a ton pushing on a thin sheet of plastic
Just as I was about to warn him about the danger of what he was doing, the pressure blew the back out of the box launching it into his leg. It left a good bruise but didn't break the skin. I was just a second or two late in my warning.
If we apply the same calculation to a window pane which is, for example, three feet on a side, that would be about ten square feet or 1440 inches. If the pressure on one side of the window was just 5 pounds (one third of atmospheric pressure) that would put a force on the window of 5 times 1440 pounds, or about 7000 pounds. That would be about 3.5 tons. It would be like putting the entire weight of your car on the window.