Question

For the use of vacuum method, the coefficient of permeability should be __________

a.

greater than 10¯³cm/s

b.

in the range 10¯³ to 10¯⁵cm/s

c.

less than 10¯⁵cm/s

d.

independent

Answer: (b).in the range 10¯³ to 10¯⁵cm/s

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Q. For the use of vacuum method, the coefficient of permeability should be __________

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