The video below describes pressure due to wind, & atmospheric pressure due to the weight of air, & also, hydrostatic pressure due to the weight of water. The video shows that the pressure due to the Alabama tornadoes or due to the hurricane Katrina are only about 1/10 th of that of atmospheric pressure. The video also shows that the hydrostatic pressure at the bottom of the Mariana Trench is about 1150 atmospheres or about 11, 520 times the maximum pressure caused by the tornadoes of Alabama. In my 'broadcast' below, I have grossly underestimated the weight of air inside the Albert Hall, London, UK. It appears that the internal volume of the Albert Hall is about 3.06 million cu. ft or about 0.0866 million cu.metres. Thus, the weight of air inside the Albert Hall is about 102.1 British tons or 114.4 American tons or 104.0 Metric tonnes!
To view the video; CLICK:
Best wishes,
Carl Ross. May 2nd, 2011.