Campbell-scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC1 Manuel d'utilisateur télécharger pdf (Page 59)

Appendix B. Useful Equations

The following table lists all the variables and constants used in the equations

below:

Table of Variables and Constants

Variable or Constant

Description

Units

Mass Density mg m

-3

O Mass Density g m

-3

Mass Density of Dry Air g m

-3

Molar Mixing Ratio

(concentration relative to dry air)

µmol mol

-1

O Molar Mixing Ratio

(concentration relative to dry air)

mmol mol

-1

Molecular Weight of CO

44 mg mmol

-1

Molecular Weight of dry air 0.029 g mmol

-1

Molecular weight of H

O 0.018 g mmol

-1

Ambient Pressure

kPa

Universal Gas Constant

8.3143×10

–6

kPa m3 K

–1

mmol

–1

Ambient Temperature

Vapor Pressure

kPa

Enhancement Factor Arbitrary

Dew Point Temperature

tmpd

Temporary variable for dew point

calculation

Arbitrary

Mass Density from Molar Mixing Ratios

( )













−

vcc

MTR

15.273

(B-1)

( )( )

XTR

PMX

100015.

273

(B-2)

( )

15.273+

−

MeP

(B-3)

( )

15.273

1000













−

(B-4)

B-1

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 69 70

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Campbell-scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC1 Manuel d'utilisateur Page 59

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