Heat Coefficients

Coefficients of Heat Transmission

Heat transmitted, in British thermal units, per second, through metal 1 inch thick, per square inch of surface, for a temperature difference of 1F.
 Metal Btu per second  Metal Btu per second  Metal Btu per second
  Aluminum   0.00203   German Silver   0.00050   Steel, soft   0.00062
  Antimony   0.00022   Iron   0.00089   Silver   0.00610
  Brass, yellow   0.00142   Lead   0.00045   Tin   0.00084
  Brass, red   0.00157   Mercury   0.00011   Zinc   0.00170
  Copper   0.00404   Steel, hard   0.00034        

Coefficients of Heat Radiation

Heat radiated, in British thermal units, per square foot of surface per hour, for a temperature difference of 1F.
 Surface Btu per Hour  Surface Btu per hour
  Cast-iron, new   0.6480   Sawdust   0.7215
  Cast-iron, rusted   0.6868   Sand, fine   0.7400
  Copper, polished   0.0327   Silver, polished   0.0266
  Glass   0.5948   Tin, polished   0.0439
  Iron, ordinary   0.5662   Tinned iron, polished   0.0858
  Iron, sheet, polished   0.0920   Water   1.0853
  Oil   1.4800        

Freezing Mixtures

 Mixture Temperature Change, Degrees F.
From To
  Common salt (NaCl), 1 part; snow, 3 parts   32   0
  Common salt (NaCl), 1 part; snow, 1 part   32   -0.4
  Calcium chloride (CaCl2), 3 parts; snow, 2 parts   32   -27
  Calcium chloride (CaCl2), 2 parts; snow, 1 part   32   -44
  Sal ammoniac (NH4Cl), 5 parts; saltpeter (KNO3), 5 parts; water 16 parts   50   +10
  Sal ammoniac (NH4Cl), 1 part; saltpeter (KNO3), 1 part; water 1 part   46   -11
  Ammonium nitrate (NH4NO3), 1 part; water, 1 part   50   +3
  Potassium hydrate (KOH), 4 parts, snow, 3 parts   32   -35

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- Heat Coefficients

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