Youtube Space Lab Entry - Fluid Density in Outer Space (Sphere Machine)





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Uploaded on Dec 13, 2011

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NOTE- please, if you need to examine the Diagrams or table of densities, just pause the video. I ran out of time so i put them in really fast.

NOTES ABOUT THE EXPERIMENT - i ran out of time so i had to omit some important specs about the experiment:

1) The experiment is meant to test several fluids if possible: water, alcohol, oil, soda, milk, sea water and mercury (if permitted)

2) IF YOU WATCHED THE DIAGRAMS CLOSELY: you should have noticed the existence of a VACUUM OR PRESSURE PUMP. To make the experiment more interesting, a pressure pump could be attached to the sealed cylinder and create more varied conditions for the fluids. This could help on obtaining better results, as pressure changes the values of density inside the cylinder.

3) The "needle" from which fluids come out, can also be a plastic tube (with a small diameter) or any other hollow tube. The purpose of the small diameter is to mantain surface tension on the liquid sphere as to not get separated from the tube and let other fluids in.

thank you ^^

MORE THINGS YOU SHOULD KNOW- As liquids are left out in the spacecraft's cabin, they float freely, that's when they adopt spherical shapes or similar to bubbles. (Why? In space, gravity is almost cero, so the only force acting on the liquid is SURFACE TENSION; the only way for the liquid to accommodate is in the shape of a sphere. The geometry of the fluid is issued as a way it represents a minimum in energy: surface tension.

What is 'Plexiglass'? Poly(methyl methacrylate) is commonly known as plexiglass (it's a trademark) which is a strong and resistant substitute for glass. It is transparent and has close properties to a plastic. Common uses of PMMA are: aquarium glass, automovile headlights, expectator protection in hockey rinks, riot police protection, etc. So now you know what Plexiglass is!



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