uncertAirDensity: Uncertainties in air density calculations

In masscor: Mass Measurement Corrections

Description

Propagates the uncertainty of environmental conditions measurements to estimated values of air densities calculated using the function airDensity() with models 'CIMP2007' y 'CIMP.approx' function. Uncertainty arising from to the chosen model itself is considered. Calculations are made according to the Guide to the Guide to the expression of uncertainty in measurement (GUM, JCGM, 2008) as implemented by the package metRology (Ellison, 2018).

Usage

uncertAirDensity(model = "CIMP2007", Temp = 20, p = 1013.25, h = 50,
  u_Temp = 2.9, u_p = 10.1, u_h = 11.3, unitsENV = c("deg.C", "hPa",
  "%"), plot = TRUE, printRelSD = TRUE)

Arguments

model	model to use for air density calculation. Must be one of 'CIMP2007' (default), 'CIMP.approx' or 'Jones1978'. See See Details for references.
Temp	ambient temperature in weighing room.
p	barometric pressure in weighing room.
h	relative humidity in weighing room.
u_Temp	standard uncertainty of temperature measurement
u_p	standard uncertainty of barometric pressure measurement
u_h	standard uncertainty of relative humidity
unitsENV	character vector of length three with the units of p, Temp and h. Default is c('deg.C', 'hPa', '%'). See unitsENV below for more options.
plot	logical. If TRUE (the default), the relative uncertainty contributions are shown in a barplot.
printRelSD	Logical. If TRUE (the default), a short statement indicating relative standard uncertainty of the air density estimation is printed.

Value

A numeric value of standard uncertainty of calculated air density in g~cm^{-3}.

unitsENV

Temperature units (Temp) can be either 'deg.C' (for Celsius degrees) or 'K'. Pressure units (p) can be any of 'mmHg', 'Pa', 'hPa' or 'kPa'. Relative humidity (h) can be expressed as fraction ('frac') or as percentage ('%'). A typical arrangement for the parameter unitsENV would be c('deg.C', 'hPa', '%').

References

Picard, A; Davis, R S; Gläser, M; Fujii, K (2008). Revised formula for the density of moist air (CIPM-2007). Metrologia, 45(2), 149–155. doi:10.1088/0026-1394/45/2/004

Harris, G. (2019). Selected Laboratory and Measurement Practices and Procedures to Support Basic Mass Calibrations. SOP 2 - Recommended Standard Operating Procedure for Applying Air Buoyancy Corrections. National Institute of Standards and Technology (NIST). doi:10.6028/NIST.IR.6969-2019

BIMP JCGM (2008) Evaluation of measurement data — Guide to the expression of uncertainty in measurement.

Stephen L R Ellison. (2018). metRology: Support for Metrological Applications. R package version 0.9-28-1. https://CRAN.R-project.org/package=metRology

See Also

airDensity()

Examples

 uncertAirDensity(model = 'CIMP2007',
                  Temp = 20, p = 1013.25, h = 50,
                  u_Temp = 0.29, u_p = 1.01, u_h = 11.3)

masscor documentation built on Sept. 13, 2021, 9:06 a.m.