Comparison Display

CCM.V-K4.A

MEASURAND Kinematic viscosity

NOMINAL VALUE 140 mm²/s at 20 °C

Degrees of equivalence represented by D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mm²/s.

Kinematic viscosity of Liquid A at 20 °C

D_i /(mm²/s)

Participating institutes

Enlarged graph
LiquidA@20°C

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CCM.V-K4.A

MEASURAND Kinematic viscosity

NOMINAL VALUE 55 mm²/s at 40 °C

Degrees of equivalence represented by D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mm²/s.

Kinematic viscosity of liquid A at 40 °C

D_i /(mm²/s)

Participating institutes

Enlarged graph

Graph_LiquidA@40°C

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CCM.V-K4.A

MEASURAND Kinematic viscosity

NOMINAL VALUE 10 mm²/s at 100 °C

Degrees of equivalence represented by D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mm²/s.

Kinematic viscosity of liquid A at 100 °C

D_i /(mm²/s)

Participating institutes

Enlarged graph

Graph_LiquidA@100°C

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CCM.V-K4.A

MEASURAND Kinematic viscosity

NOMINAL VALUE 140 mm²/s at 20 °C

Degrees of equivalence represented by D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mm²/s.

LAB_i	D_i	U_neg,i	U_pos,i
	mm²/s	mm²/s	mm²/s
CENAM	0.03	0.29
GUM	0.01	0.21
INMETRO	-0.37	0.18
NIM	0.00	0.29
NMIJ	-0.03	0.12
PTB	0.02	0.24
SMU	0.04	0.39
VNIIM	0.12	0.17
IPQ	-0.34	1.00
NIS	3.50	8.10
SASO-NMCC	0.76	0.42

Participating institutes

CCM.V-K4.A

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CCM.V-K4.A

MEASURAND Kinematic viscosity

NOMINAL VALUE 55 mm²/s at 40 °C

Degrees of equivalence represented by D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mm²/s.

LAB_i	D_i	U_neg,i	U_pos,i
	mm²/s	mm²/s	mm²/s
CENAM	-0.011	0.130
GUM	0.020	0.072
INMETRO	-0.073	0.048
NIM	-0.016	0.100
NMIJ	0.016	0.025
PTB	0.024	0.083
SMU	0.008	0.130
VSL	-0.044	0.120
VNIIM	0.023	0.044
IPQ	0.110	0.480
NIS	2.300	3.210
SASO-NMCC	-1.100	0.160

Participating institutes

CCM.V-K4.A

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CCM.V-K4.A

MEASURAND Kinematic viscosity

NOMINAL VALUE 10 mm²/s at 100 °C

Degrees of equivalence represented by D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mm²/s.

LAB_i	D_i	U_neg,i	U_pos,i
	mm²/s	mm²/s	mm²/s
CENAM	-0.0083	0.017
INMETRO	-0.0066	0.010
NIM	-0.0066	0.015
NMIJ	0.0160	0.009
PTB	0.0023	0.010
VNIIM	0.0060	0.010
IPQ	0.0260	0.065
NIS	0.0190	0.510
SASO-NMCC	0.0210	0.020

Participating institutes

CCM.V-K4.A

Comparison

Comparison close

CCM.V-K4.A

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Information & contact
Participants

Metrology area, Sub-field	Mass and related quantities, Viscosity
Description	Viscosity measurements of standard liquids
Time of measurements	2018
Status	Approved for equivalence

Final Reports of the comparisons	Metrologia 2025 62 Tech. Suppl. 07002
Measurand	Kinematic viscosity 140 mm²/s at 20 °C 55 mm²/s at 40 °C 10 mm²/s at 100 °C
Parameters	Temperature: 20 °C, 40 °C and 100 °C
Transfer device	Standard liquid A : poly-alpha-olefine

Comparison type	Key Comparison
Consultative Committee	CCM (Consultative Committee for Mass and Related Quantities)
Conducted by	CCM (Consultative Committee for Mass and Related Quantities)
Pilot institute	CENAM Centro Nacional de Metrologia Mexico
Contact person	Sonia Trujillo Juarez +52 442 11 0500

Pilot laboratory
CENAM	Centro Nacional de Metrologia, Mexico, SIM

GUM	Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET

INMETRO

Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM

IPQ	Instituto Portugues da Qualidade, Portugal, EURAMET

NIM	National Institute of Metrology, China, APMP

NIS	National Institute for Standards, Egypt, AFRIMETS

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

PTB	Physikalisch-Technische Bundesanstalt, Germany, EURAMET

SASO-NMCC

National Measurement and Calibration Center - Saudi Standards, Metrology and Quality Organization, Saudi Arabia, GULFMET

SMU	Slovensky Metrologicky Ustav, Slovakia, EURAMET

VNIIM

D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET

VSL	VSL, Netherlands, EURAMET

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CCM.V-K4.A

MEASURAND Kinematic viscosity

NOMINAL VALUE 140 mm²/s at 20 °C

The key comparison reference value x_R and its associated standard uncertainty u_R are computed from the median of the reported results, using the Monte-Carlo method from 1 000 000 trials.

x_R = 137.64 mm²/s u_R = 0.053 mm²/s

The degree of equivalence of laboratory i relative to the key comparison reference value x_R is given by a pair of terms, both expressed in mm²/s:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence.

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CCM.V-K4.A

MEASURAND Kinematic viscosity

NOMINAL VALUE 55 mm²/s at 40 °C

The key comparison reference value x_R and its associated standard uncertainty u_R are computed from the weighted mean of the reported results.

x_R = 53.644 mm²/s u_R = 0.0105 mm²/s

The degree of equivalence of laboratory i relative to the key comparison reference value x_R is given by a pair of terms, both expressed in mm²/s:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence where U_i = 2 (u_i² - u_R²)^1/2

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CCM.V-K4.A

MEASURAND Kinematic viscosity

NOMINAL VALUE 10 mm²/s at 100 °C

The key comparison reference value x_R and its associated standard uncertainty u_R are computed from the median of the reported results, using the Monte-Carlo method from 1 000 000 trials.

x_R = 8.874 mm²/s u_R = 0.0035 mm²/s

The degree of equivalence of laboratory i relative to the key comparison reference value x_R is given by a pair of terms, both expressed in mm²/s:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence.

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CCM.V-K4.A

MEASURAND Kinematic viscosity

NOMINAL VALUE 140 mm²/s at 20 °C

x_i measured mass fraction reported by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

Lab_i	x_i	u_i
Lab_i	mm²/s	mm²/s
CENAM	137.67	0.16
GUM	137.65	0.11
INMETRO	137.28	0.076
NIM	137.64	0.16
NMIJ	137.61	0.045
PTB	137.66	0.13
SMU	137.68	0.21
VNIIM	137.76	0.069
IPQ	137.30	0.50
NIS	141.13	4.04
SASO-NMCC	138.40	0.21

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CCM.V-K4.A

MEASURAND Kinematic viscosity

NOMINAL VALUE 55 mm²/s at 40 °C

Lab_i	x_i	u_i
Lab_i	mm²/s	mm²/s
CENAM	53.633	0.067
GUM	53.664	0.038
INMETRO	53.572	0.026
NIM	53.628	0.051
NMIJ	53.660	0.016
PTB	53.668	0.043
SMU	53.652	0.067
VSL	53.600	0.062
VNIIM	53.668	0.024
IPQ	53.756	0.239
NIS	55.963	1.603
SASO-NMCC	52.542	0.081

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CCM.V-K4.A

MEASURAND Kinematic viscosity

NOMINAL VALUE 10 mm²/s at 100 °C

Lab_i	x_i	u_i
Lab_i	mm²/s	mm²/s
CENAM	8.8652	0.0093
INMETRO	8.8669	0.0042
NIM	8.8669	0.0089
NMIJ	8.8896	0.0024
PTB	8.8758	0.0058
VNIIM	8.8795	0.0049
IPQ	8.8992	0.0325
NIS	8.8922	0.2548
SASO-NMCC	8.8944	0.0107

KCDB

CIPM MRA

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Key and supplementary comparisons - Print out