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Tube Sealed
Tube Sealed
Piston in a sealed tube?


Let's say you have a bottomed out piston in a completely sealed tube. When you pull this piston outward, it will create a perfect vacuum in the tube. Is there an equation which will show the force required to pull out the piston? Let's just say that the piston is 3 inches in diameter and you have a pull distance of 20 inches. Ignoring any other forces such as friction, or breakage of materials

I just want to know how much force is required to create a perfect vacuum.

Force or energy? The force on the piston is constant; the energy depends on the distance. Then there is the question of the force on the tube.

On the surface of the Earth, the air pressure is about 15 pounds/square inch.

http://en.wikipedia.org/wiki/Atmospheric_pressure
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GoGos - Lips are sealed - The Tube - 1980s



How do I keep blood from coagulating or going bad in a sealed tube at room temp.? It can be diluted up to 50%?


Can be diluted up to 50% Needs to stay red.

Add either EDTA or citrate.