ASTM D3631-99(2011)

Standard Test Methods for Measuring Surface Atmospheric Pressure


Over deze norm

Status Definitief
Aantal pagina's 5
Commissie D22.11
Gepubliceerd op 01-10-2011
Taal Engels

1.1 These 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 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 h 2, 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 methods provide instantaneous values only.

1.5 The values stated in SI units are to be regarded as the 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.

TABLE 1 Selected Values

Pressure P1, Pa
110 000100 00090 00080 00070 000
Correction to P1, Pa/m, positive if h1 > h, negative if h1 < h2
230 1615131210
240 1614131110
250 1514121110
260 14131211 9
270 14131110 9
280 13121110 9
290 131211 9 8
300 131110 9 8
310 121110 9 8


ICS-code 07.060
Nederlandse titel Standard Test Methods for Measuring Surface Atmospheric Pressure
Engelse titel Standard Test Methods for Measuring Surface Atmospheric Pressure



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