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  • ASTM
    D3631-99(2017) Standard Test Methods for Measuring Surface Atmospheric Pressure
    Edition: 2017
    $144.00
    Unlimited Users per year

Description of ASTM-D3631 2017

ASTM D3631-99-Reapproved2017

Active Standard: Standard Test Methods for Measuring Surface Atmospheric Pressure




ASTM D3631

Scope

1.1 These test methods cover the measurement of atmospheric pressure with two types of barometers: the Fortin-type mercurial barometer and the aneroid barometer.

1.2 In the absence of abnormal perturbations, atmospheric pressure measured by these test methods at a point is valid everywhere within a horizontal distance of 100 m and a vertical distance of 0.5 m of the point.

1.3 Atmospheric pressure decreases with increasing height and varies with horizontal distance by 1 Pa/100 m or less except in the event of catastrophic phenomena (for example, tornadoes). Therefore, extension of a known barometric pressure to another site beyond the spatial limits stated in 1.2 can be accomplished by correction for height difference if the following criteria are met:

1.3.1 The new site is within 2000 m laterally and 500 m vertically.

1.3.2 The change of pressure during the previous 10 min has been less than 20 Pa.

The pressure, P2 at Site 2 is a function of the known pressure P1 at Site 1, the algebraic difference in height above sea level, h1 −  h2, and the average absolute temperature in the space between. The functional relationship between P1 and P2 is shown in 10.2. The difference between P1 and P2 for each 1 m of difference between h1 and h2 is given in Table 1 and 10.4 for selected values of P1 and average temperature.

1.4 Atmospheric pressure varies with time. These test methods provide instantaneous values only.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific safety precautionary statements are given in Section 7.


Keywords

aneroid barometer; atmospheric pressure; barometer; barometry; Fortin-type mercurial barometer; mercurial barometer; pressure;


ICS Code

ICS Number Code 07.060 (Geology. Meteorology. Hydrology)


DOI: 10.1520/D3631-99R17



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