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ASTM D3631-99(2017)
Standard Test Methods for Measuring Surface Atmospheric Pressure
NORMA vydaná dňa 1.3.2017
Informácie o norme:
Označenie normy: ASTM D3631-99(2017)
Dátum vydania normy: 1.3.2017
Kód tovaru: NS-678290
Počet strán: 5
Približná hmotnosť: 15 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D3631-99(2017) :
Keywords:
aneroid barometer, atmospheric pressure, barometer, barometry, Fortin-type mercurial barometer, mercurial barometer, pressure,, ICS Number Code 07.060 (Geology. Meteorology. Hydrology)
Doplňujúce informácie
| Significance and Use | ||||||
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5.1 Atmospheric pressure is one of the basic variables used by meteorologists to describe the state of the atmosphere. 5.2 The measurement of atmospheric pressure is needed when differences from “standard” pressure conditions must be accounted for in some scientific and engineering applications involving pressure dependent variables. 5.3 These test methods provide a means of measuring atmospheric pressure with the accuracy and precision comparable to the accuracy and precision of measurements made by governmental meteorological agencies. |
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| 1. Scope | ||||||
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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 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. |
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| 2. Referenced Documents | ||||||
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