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The Water Cooler
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Actual facts needed about storm shelters being sucked out of the ground/doors failing
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<blockquote data-quote="Pulp" data-source="post: 2202515" data-attributes="member: 14195"><p>Time for a bit of physics here. </p><p></p><p>1. There is no such thing as suction. There is only pressure differential. Air will move from high pressure to low pressure. As a tornado passes over a cellar, the pressure outside the cellar lowers. It does not "suck" the door off. The higher pressure inside the cellar blows the door open or off. You do not "suck" water through a straw, you just lower the pressure in the straw. The higher pressure on the surface of the liquid pushes water into and up the straw.</p><p></p><p>In the opening scene of "Twister", had the father just sat in the back corner of the cellar with his family and allowed the</p><p>the door to blow off, he'd have been in the movie much longer. When the door blew off he couldn't let go of the rope in time so he went with it. Wife and daughter remained safe in the back. So, if you find yourself in a cellar during a storm and the door starts shaking, let it go. Just go to the farthest corner from the door.</p><p></p><p>2. "Sucking" cellars out of the ground: the only way this would be possible is somehow air at higher pressure could get under the cellar. Or possibly water pressure from high ground water levels as mentioned are common in the Moore area. You absolutely have to have a higher pressure under the cellar than above it.</p><p></p><p>Disclaimer: I don't have a degree in Physics. I could be totally wrong. Just my way of seeing things, and playing with fans and vacuum cleaners etc. If my thinking is wrong, please feel free to correct me. Won't hurt my feelings, been wrong before and I'm still alive.</p></blockquote><p></p>
[QUOTE="Pulp, post: 2202515, member: 14195"] Time for a bit of physics here. 1. There is no such thing as suction. There is only pressure differential. Air will move from high pressure to low pressure. As a tornado passes over a cellar, the pressure outside the cellar lowers. It does not "suck" the door off. The higher pressure inside the cellar blows the door open or off. You do not "suck" water through a straw, you just lower the pressure in the straw. The higher pressure on the surface of the liquid pushes water into and up the straw. In the opening scene of "Twister", had the father just sat in the back corner of the cellar with his family and allowed the the door to blow off, he'd have been in the movie much longer. When the door blew off he couldn't let go of the rope in time so he went with it. Wife and daughter remained safe in the back. So, if you find yourself in a cellar during a storm and the door starts shaking, let it go. Just go to the farthest corner from the door. 2. "Sucking" cellars out of the ground: the only way this would be possible is somehow air at higher pressure could get under the cellar. Or possibly water pressure from high ground water levels as mentioned are common in the Moore area. You absolutely have to have a higher pressure under the cellar than above it. Disclaimer: I don't have a degree in Physics. I could be totally wrong. Just my way of seeing things, and playing with fans and vacuum cleaners etc. If my thinking is wrong, please feel free to correct me. Won't hurt my feelings, been wrong before and I'm still alive. [/QUOTE]
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Actual facts needed about storm shelters being sucked out of the ground/doors failing
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