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If the balloon was completely isolated from the outside atmosphere and contained a certain gas (in this case helium), then the helium will exert a pressure outwards, attempting to expand the balloon. The atmosphere outside will also exert a pressure inwards, attempting to keep the balloon in a small shape. These two forces compete, and the balloon will ...


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I'm not a professor of chemistry or anything, but on a computer screen, Orange equals about 2 parts red and 1 part green on the RGB scale. Using the chart in the link below: http://www.scienceclarified.com/Ga-He/Gases-Properties-of.html You can get green from Chlorine gas and Red/Brown from NO2. Chlorine is highly reactive so in reality, I don't think ...


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Simple geometry says no. Consider a projectile which is launched from the earth's surface at some angle other than vertical, ignoring the effects of air friction. Once the launch force is terminated, if the object is travelling less than escape velocity, the object will assume a closed elliptical orbit around the center of the earth (well, OK, around the ...


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Today I have noticed that our humidity is extremely high compared to yesterday. The temp is about approx 5degrees F warmer today than yesterday. I just shot 30 rounds and noticed without any bias on this subject (no previous opinion) that my rounds were landing .125" higher than yesterdays 30 rounds. Hence why I am researching this subject of humidity and ...


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Laser Doppler velocimetry can be used. Generally it is used to measure velocity of this range for any transparent fluid flow.


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From the Wikipedia article on fog: Sound typically travels fastest and farthest through solids, then liquids, then gases such as our atmosphere. The distance the water molecules are from each other, and temperature, are the reasons sound is affected during a fog condition. Molecule effect: Though fog is essentially water, the molecules are barely ...


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According to this link sound (especially high frequency sound) is more attenuated in fog, because it is dispersed by the (billions of) air-water interfaces of all the droplets. This is one reason why a fog horn is a very low sound - low frequencies travel further, especially in fog. For echolocation you want to use high frequencies, and fog is more ...


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As a planetary science and aviation enthusiast I can offer these tidbits, although a bit late for the 2013 posted question.... http://www.wired.com/2010/05/gallery-clouds/ This shows mountain-induced Van Karman vortex street (Strouhal instability) in a cloud layer as viewed from space. and so does this: ...


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The walls of the structure, in this case .2m of polystyrene, are themselves solid and rigid. They provide pressure which fills up the space between the inside surface and the outside surface, effectively adding to the atmospheric pressure inside the cube. If the polystyrene is foamed, there would be pressure from the gas inside the polystyrene bubbles ...


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The argument is that the air was flowing through the hole at around 700 mph, so the air inside the aircraft had a substantial velocity in the direction of the hole. The air velocity inside the plane would have been less than 700 mph because the flow was converging on the hole, but the speed of the air would still have been hundreds of mph. When the hole was ...



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