From IVoM:

quantity value
value of a quantity
value
number and reference together expressing magnitude of a quantity

EXAMPLES

a) Length of a given rod	5.34 m or 534 cm
b) Mass of a given body	0.152 kg or 152 g
c) Curvature of a given arc	112 m−1
d) Celsius temperature of a given sample	−5 °C
e) Electric impedance of a given circuit element at a given frequency, where j is the imaginary unit	(7 + 3j) Ω
f) Refractive index of a given sample of glass	1.32
g) Rockwell C hardness of a given sample (150 kg load)	HRC(150 kg) 43.5
h) Mass fraction of cadmium in a given sample of copper	3 μg/kg or 3 × 10−9
i) Molality of Pb2+ in a given sample of water	1.76 mmol/kg
j) Force acting on a given particle	(−31.5; 43.2; 17.0) N

NOTES

1 — A quantity value either is
• a product of a number and a measurement unit (the unit one is generally not indicated for
quantities of dimension one), or
• a number and a reference to a measurement procedure, or
• a number and a reference material.

2 — The number can be real or complex.

3 — A quantity value can be presented in more than one way.

4 — In the case of vector or tensor quantities, each component has a value as defined above.

Note that force is a vector, and that electric imedance is complex.