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Modern vacuum pumps can evacuate vessel down to a pressure 4 0 x 10 5...

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Modern vacuum pumps can evacuate vessel down to a pressure 4 0 x 10 5 atm at room temperature 300 K Taking R 8 3 JK mole 1 atm 105 Pa and NAvogadro 6 10 mole the mean distance between molecules of gas in an evacuated vessel will be of the order of A B C D 0 2 m 0 2 nm 0 2 cm 0 2 mm MY

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