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A mercury manometer using capacitance sensing of meniscus positions has been refined to give an accuracy within 2 parts in 10 6 of the pressure in the range from 1 × 10 4 to 1.3 × 10 5 N/m 2 . The determination of pressure ratios is accurate within 1.5 parts in 10 6 for pressures in the same range.
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Guildner et al. (1970) studied this question.
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