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Unformatted text preview: is a better choice because it only requires a column of 7.5 cm. The absolute pressure measured is 111.325 kPa. 2 2 Manometers at 1400 m above sea level If the experiment takes place at 1400 m above sea level, with the same gage pressure, none of the heights will change. Because the height calculation is based on a pressure diﬀerence, it doesn’t matter what the reference pressure is, as long as the gage pressure remains the same. However, because the reference pressure changes, the absolute pressure will change to 95.6 kPa. 3 Fixed Column A water manometer with a 1 m high column can measure a pressure diﬀerence of: Δ p = ρgh = ( 1000 kg / m 3 ) ( 9 . 8 m / s 2 ) (1 m) = 9800 Pa A mercury manometer of the same height can measure a pressure diﬀerence of: Δ p = ( 13560 kg / m 3 ) ( 9 . 8 m / s 2 ) (1 m) = 132888 Pa 3...
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 Fall '08
 STAFF
 kPa, sea level

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