Measuring the ratio of the water vapor’s partial pressure divided by the saturation water vapor pressure allowed at a given temperature.
Required Parameters
Optional Parameters
Measured Value & Uncertainty
Measuring the ratio of the total mass of the water vapor divided by the total volume of air.
This is also called volumetric humidity.
Required Parameters
Optional Parameters
Measured Value & Uncertainty
Sourcing the ratio of the mass of water vapor to the total mass of the dry air. The gravimetric method of calibration determines the specific humidity, with pressure and temperature having no effect on the masses.
Also referred to as moisture content,
Required Parameters
Optional Parameters
Measured Value & Uncertainty
The generation of relative humidity as a ratio of the water vapor’s partial pressure divided by the saturation water vapor pressure allowed at a given temperature.
Required Parameters
Optional Parameters
Measured Value & Uncertainty
The generation of humidity as a ratio of the total mass of the water vapor divided by the total volume of air.
This is also called volumetric humidity.
Required Parameters
Optional Parameters
Measured Value & Uncertainty
Test Process that sources a Force as defined as mass times acceleration (F = m * a). The formula describes a free mass or the net force on any mass. Dead-weight force measurements depend on true mass, specific location’s influences, such as local gravity, air buoyancy, and material density are often needed. Equal but opposite forces counteract to cancel any net motion or acceleration, but result in a deformation of the objects which can be measured.
This test process is typically used to calibrate devices like load cells, multi-axis transducers, proving rings, force gauges, traction dynamometers, crane scales, bolt testers, aircraft scales, load cell washer, truck wheel load scales, miniature load cells, handheld force gauges, etc.
When sourcing mass of a physical object See TestProcess.Source.Mass.True
Required Parameters
Optional Parameters
Measured Value & Uncertainty
Test Process that sources a conventional value of the result of weighing a body in air equals the mass of a standard that balances this body under the following conventionally chosen conditions:
Conventional mass has the same unit as mass (the kilogram), because the multiplication of a mass by a dimensionless quantity defines its values. Labs typically measure mass and correct the results from actual to conventional conditions.
“Apparent Mass versus 8.0 g/cm³” formerly equated to conventional mass in the United States.
References:
NISTIR 6969 (2019) https://www.nist.gov/publications/nistir-6969-selected-laboratory-and-measurement-practices-and-procedures-support-1
OIML D28 (2004) https://www.oiml.org/en/files/pdf_d/d028-e04.pdf
NIST Handbook 44:
Required Parameters
Optional Parameters
Measured Value & Uncertainty
Test Process that sources a quantity of matter which a body contains, as measured by its acceleration under a given force or by the force exerted on it by a gravitational field.
The term “mass” is always used in the strict Newtonian sense as a property intrinsic to matter. Mass is the proportionality constant between a force on a material object and its resulting acceleration. This property is sometimes referred to as “true mass”, “vacuum mass”, or “mass in a vacuum” to distinguish it from conventional [apparent] mass.
The true quantity of matter represented in a vacuum with no gravitational force.
Required Parameters
Optional Parameters
Measured Value & Uncertainty
Test Process that sources a solid’s density as defined by the amount of mass present in a specified volume temperature. Temperature affects density as solids expand and contract according to their temperature coefficients.
** Includes voids and non-uniformity
Required Parameters
Optional Parameters
Measured Value & Uncertainty
Test Process that sources a liquid’s density as defined by the amount of mass present in a specified volume of liquid at a given temperature. Temperature affects density, as does the pressure to the extent that the liquid compresses. In, liquids deemed sufficiently incompressible, the volume does not depend on pressure.
Required Parameters
Optional Parameters
Measured Value & Uncertainty