BS 874:1973

Co-operating organizations
Foreword
Introduction
Methods
1 General
1.1 Scope
1.2 Definitions
2 General principles of measurement
2.1 Thermal conductivity, conductance and transmittance
2.2 Emissivity
2.3 Heat capacity per unit mass
3 Testing conditions and test reports
3.1 Temperatures of test
3.2 Conditioning of materials
3.3 Moisture content
3.4 Test reports
4 Methods for determining thermal properties
4.1 General
4.2 Thermal conductivity
4.3 Thermal transmittance and thermal conductance
     (above approximately 0.7 W/(m2K))
4.4 Emissivity
4.5 Heat capacity per unit mass (temperatures up to
     approximately 1000 deg C)
5 References
Appendices
A Additional methods of measuring thermal
     conductivity
B Heat flow meter method of measuring thermal
     conductivity with two test specimens
C Heat flow meter method of measuring thermal
     conductivity with a single test specimen
D Transient state method of thermal conductivity
     measurement
E Determination of thermal conductivity by the use of
     a thermal probe
F Units and conversion factors
Tables
1 Summary of symbols and dimensions of quantities
2 Common shape factors
3 Methods for determining thermal properties
4 Quantity of heat (conversion factors)
5 Thermal transmission (conversion factors)
6 Thermal conductivity (conversion factors)
7 Thermal conductance, thermal transmittance, surface
     coefficient, convection coefficient and radiation
     coefficient (conversion factors)
8 Heat capacity per unit volume (conversion factors)
9 Thermal diffusivity (conversion factors)
Figures
1 Diagram illustrating definition 2
2 Spherical vessel for low temperature conductivity
     tests
3 Heat flow meter apparatus
4 Heat flow meter with single specimen
5 Typical two specimen arrangement for transient
     flow measurement of thermal properties
6 Differential thermocouples for measurement of
     average temperature differences
7 Diagram of probe with thermocouple reference
     junction