Midwest Storms

[larryinlc]

Will super low barometric pressure affect water level in my toilet?? I know what you're thinking...what the heck?? I'm just asking and this is a serious question.

Larry

Originally Posted by larryinlc

Will super low barometric pressure affect water level in my toilet?? I know what you're thinking...what the heck?? I'm just asking and this is a serious question.

Larry

OK then, serious answer.
It depends on the pressure in the sewer pipe. Most of the time it is vented, so the pressure would drop equally on the pipe side and the bowl side, the water level would be unaffected. If there is some back pressure then the level might rise a little but you would not be likely to notice. If you had back pressure the water level could be different every time you flush anyway.

You can make a barometer from a clear tube closed off at one end and a bowl of water. You fill the tube up with water, close the open end with your thumb and dunk it in the water. You may have to leave a little air in the tube. When you hang the sealed off end of the tube straight up the weight of the water in it will pull a vacuum. The air pressure on the bowl of water will determine the level of the water in the tube. They do this same thing with mercury and that's what the inches in the pressure readings mean. How high the air pressure will push the mercury up the tube. Vacuum can never pull a liquid up more than a certain limit. Pressure has no limit except power. That's why pumps go at the bottom of a deep well.