Why Does the Sky Appear Blue?

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Simple question...always wondered why it's blue. :rolleyes:
 
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Because of "Rayleigh scattering".

i.e., the fact that scattering of light depends on its frequency. Blue light is scattered much more that red light.
 
Thread 'Question about pressure of a liquid'

Thread 'Question about pressure of a liquid'

I am looking at pressure in liquids and I am testing my idea. The vertical tube is 100m, the contraption is filled with water. The vertical tube is very thin(maybe 1mm^2 cross section). The area of the base is ~100m^2. Will he top half be launched in the air if suddenly it cracked?- assuming its light enough. I want to test my idea that if I had a thin long ruber tube that I lifted up, then the pressure at "red lines" will be high and that the $force = pressure * area$ would be massive...
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