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

Meanings of relevant symbols with SI units. Dimensions, determination of thermal properties over various temperature ranges. Measurement of thermal conductivity, conversion tables for common units appended.