An Accurate Mercury Manometer for the NBS Gas Thermometer

A mercury manometer using capacitance sensing of meniscus positions has been refined to give an accuracy within 2 parts in 106 of the pressure in the range from 1 × 104 to 1.3 × 105 N/m2. The determination of pressure ratios is accurate within 1.5 parts in 106 for pressures in the same range.

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