05 Sep '07 20:49>
An early scientist, like around 1850, decides to make a vacuum, so he figures he will start with a piston that will pull a slider out of a chamber and therefore reduce the air pressure in the chamber. So the chamber has a volume of one cubic meter, one meter on all sides and one of the sides is a slider with a perfectly good seal so if you move it out, the pressure goes down. So its a cylinder shaped container and you can see if you move the slider so the air pressure is cut in half, you have now two cubic meters of space inside the vacuum chamber.
How long does the piston have to be, that is to say, how far does the slider have to open up to get to one Milli-Torr of vacuum reading?
How long does the piston have to be, that is to say, how far does the slider have to open up to get to one Milli-Torr of vacuum reading?