Book - School of Science and Technology

Units and quantities 3Table 1.1 Properties of materialsMaterialSpecific mass(density)(kg/m 3 )Specific heatcapacity(kJ/kg K)Thermalconductivity(k)(W/m K)Coeff. of linearexpansion perkelvin(10 6 )Metalsaluminium (sheet) 2700 0.88 230 25.6brass (cast) 8500 0.39 110 18.7copper (sheet) 8600 0.39 384 17.5iron (east) 7500 0.53 56 10.1lead (cast) 11340 0.13 35 29.0mild steel (ingot) 7800 0.48 45 11.3tin (sheet) 7300 0.24 65 21.4zinc (sheet) 7000 0.39 113 26.1Building materialsasbestos cement (sheet) 700 1.05 0.36 9.9asbestos cement (decking) 1500 1.05 0.36 9.9asphalt 1600 1.00 0.50 ±brickwork (protected) 1700 0.8 0.62 2.2brickwork (exposed) 1700 0.8 0.84 2.2concrete (no fines) 1800 0.84 0.96 9.9concrete (pre-cast, heavy) 2000 0.84 1.3 9.9concrete (pre-cast, medium) 1150 0.84 0.37 9.9concrete block (heavy) 2240 0.84 1.31 9.9concrete block (light) 620 0.84 0.24 9.9external render (8% moisture) 1330 1.0 0.79 9.9glass (sheet) 2500 0.84 1.05 8.4granite 2880 0.84 3.49 7.9limestone 2180 0.72 1.50 6.3plaster (dense) 1200 0.84 0.52 ±plaster (lightweight) 800 0.84 0.22 ±plasterboard 950 0.84 0.16 ±roofing felt layers 960 0.84 0.19 ±screed (cement) 2100 0.65 1.40 ±slate 2750 0.84 1.72 6.0stone chippings 1800 1.0 0.96 ±tiles (clay) 1900 0.80 0.84 ±Timberpitch pine 650 2.12 0.17 6.7plywood 540 1.21 0.12 7.0studding 650 1.2 0.14 7.0wall board 260 1.26 0.05 ±Miscellaneouswater at normal pressureat 4 C 999.9 4.206 0.576 ±at 20 C 998.2 4.183 0.603 ±at 100 C 958.3 4.219 0.681 ±ice 918 2.04 2.24 ±air at normal pressuredry and at 20 C 1.205 1.012 0.026 ±dry and at 100 C 0.88 1.017 0.03 ±NotesFor insulating materials see Table 2.3 (p. 29). Approximate values for the coefficient of linear expansion are retained in this edition for generalguidance.