masscor (version 0.0.7.1)

MABC: Magnitude of the Air Buoyancy Correction

Description

Calculates the Magnitude of the Air Buoyancy Correction (MABC). If no parameters are provided the function returns MABC for weighing water at standard conditions.

Usage

MABC(rho = 0.997, rho_w = 8, rho_air = airDensity())

Arguments

rho

density of the sample in \(g~cm^{-3}\)

rho_w

density of the weigths in \(g~cm^{-3}\)

rho_air

density of the air in \(g~cm^{-3}\). If not provided, the value returned by the function airDensity() with no parameters is used. See airDensity() for details.

Value

Numeric value of the Magnitude of the Air Buoyancy Correction factor.

Details

Comparing masses (weighing) in air produces results that are influenced by the objects densities due to their buoyancy in air. This air buoyancy effects are usually small but must be taken in account when high accuracy is required. The effect can be corrected by using the densities of the object, the mass standard and the air filling the room where the measurement process takes place (Harris, 2019).

The uncertainty associated to MABC can be calculated by the function uncertMABC().

References

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

See Also

uncertMABC(), airDensity(), uncertMABC()

Examples

# NOT RUN {
## Magnitude of the air buoyancy correction for some materials:
# Water
MABC()
# Zinc metal
MABC(rho = 7.133)
# Copper metal
MABC(rho = 8.96)
# }