Use law of linear vacuum plan to measure alveolus element to shed conductance to be able to reduce uncertainty of measurement. Will one constant in the standard container that the onefold gas of discharge introduces cubage to be V, partial gas can measure conductance to pour out of standard container for the alveolus of C through waiting for; According to discharge conversation law, can list equality (1) .

……………………………………… (1)

In type: Q— is constant aeriform discharge, pa•m³/ S; The cubage of V— standard container, M³; The pressure of the gas in P— standard container, pa; T— measures time, s; C— waits for the element that measures alveolus to shed conductance, M³/ S.

Seek solution (1) type gets (2) type:

………………………… (2)

In type: The pressure in container of P1—t1 hour standard, pa; P2—t₂The pressure in hour standard container, pa. By (2) type can be gotten, differ T when time₂- T₁Hasten is bordering on when ∞ is big, have:

…………………………………… (3)

That is to say the pressure in standard container lets time lengthen hasten to be bordering on one certain value, balance pressure to be worth P namely₀, have

……………………………………… (4)

Will (4) type takes the place of (2) type can get:

………………………… (5)

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