Relative volumic mass (rel.volumic mass) - Dynamic NPU Manual
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# Relative volumic mass (rel.volumic mass)

### Synonyms

Relative mass density

Rel.volumic mass

### Definition in words

Volumic mass of system 1 divided by volumic mass of system 2

Note 1: System 1 is not related to system 2

Note 2: Volumic mass (mass density) is mass of system divided by volume of the same system. The coherent unit is e.g. g/L.

Where

### Systematic terms

Relative volumic mass of component B in system 1

### Result type

Rational scale
• Value sets are positive numerical values
• Algebraic operations are allowed (a=nb; a≠nb)
Numerical values from 0-∞

### Unit

10-6, 10-3, 1 (one), 103, 106, etc.

The unit “1” (one) is ommited in the NPU syntax.

### Non-recommended terms

Relative density, specific gravity, specific weights

### Reference

Ferard G, Dybkaer R, Fuentes-Arderiu X. Compendium of Terminology and Nomenclature of Properties in Clinical Laboratory Sciences : Recommendations 2016. 1 ed: Royal Society of Chemistry; 2016. 182 p. Doi:10.1039/9781782622451.

### Clinical Chemistry

Example 1
Generic abbreviated
NPU03694 Pt—Urine; rel.volumic mass(20 °C/water, 20 °C; proc.) = ?
Full result NPU03694 Patient—Urine; relative volumic mass(20 °C/water, 20 °C; procedure) = 1.18 x one
Abbreviated result NPU03694 Pt—Urine; rel.volumic mass(20 °C/water, 20 °C; proc.) = 1.18
Written expression The relative volumic mass of Mr. Smith’s Urine is [1.18]. The calculation is performed by dividing the volumic mass of Mr. Smith’s Urine with the volumic mass of waterThe measurements in urine and water are performed at 20 °C according to procedure defined by the laboratory.
Equation

Example 2
Generic abbreviated
NPU10184 Pt—Amniotic fluid; rel.volumic mass(20 °C/water, 20 °C; proc.) = ?
Full result NPU10184 Patient—Amniotic fluid; relative volumic mass(20 °C/water, 20 °C; procedure) = 1.60 x one
Abbreviated result NPU10184 Pt—Amniotic fluid; rel.volumic mass(20 °C/water, 20 °C; proc.) = 1.60
Written expression The relative volumic mass of Mrs. Smith’s Amniotic fluid is [1.60]. The calculation is performed by dividing the volumic mass of Mr. Smith’s Amniotic fluid with the volumic mass of waterThe measurements in Amniotic fluid and water are performed at 20 °C according to procedure defined by the laboratory.
Equation

### Reference

NPU database, https://www.ifcc.org/ifcc-scientific-division/sd-committees/c-npu/npusearch/ and http://www.labterm.dk/default.aspx
• # Kind-of-property

• ## Kind-of-quantity

### Reference

• Dybkaer R. Concept system on ‘quantity’: formation and terminology. Accredit Qual Assur. 2013;18(3):253-60.
• Dybkaer R. ISO terminological analysis of the VIM3 concepts ‘quantity’ and ‘kind-of-quantity’. Metrologia. 2010;47(3):127-34.
Date Term Note
1996-01-01 Relative volumic mass Term established

QU50121