15_17_86 - CORRECTION OF BAROMETER READINGS TO 0C...

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CORRECTION OF BAROMETER READINGS TO 0°C TEMPERATURE The following corrections are used to reduce the reading of a mercury barometer with a brass scale to 0°C. The number in the table should be subtracted from the observed height of the mercu- ry column to give the true pressure in mmHg (1mmHg = 133.322 Pa). The table is calculated from the formula h = -0.0001634 ht /(1+0.0001818 t ), where h is the observed column height in mm and t the Celsius temperature. This relation is based on thermal expansion coeffi- cients of 181.8·10 –6 °C –1 for mercury and 18.4·10 –6 °C –1 for brass. Observed Height in mm t /°C 620 630 640 650 660 670 680 690 700 710 720 730 740 750 760 770 780 790 800 0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 0.10 0.10 0.10 0.11 0.11 0.11 0.11 0.11 0.11 0.12 0.12 0.12 0.12 0.12 0.12 0.13 0.13 0.13 0.13 2 0.20 0.21 0.21 0.21 0.22 0.22 0.22 0.23 0.23 0.23 0.24 0.24 0.24 0.25 0.25 0.25 0.25 0.26 0.26 3 0.30 0.31 0.31 0.32 0.32 0.33 0.33 0.34 0.34 0.35 0.35 0.36 0.36 0.37 0.37
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This note was uploaded on 12/31/2011 for the course CHEMISTRY 101 taught by Professor Dr.dason during the Fall '08 term at Davenport.

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