633 



TABLE 676.— SPREADING COEFFICIENTS, S, OF ORGANIC LIQUIDS ON 



WATER AT 20°C* 



Spreading liquids 5 = Wa 



Butyric acid 45.66 



Ethyl ether 45.50 



Isoamyl chloride 33.88 



Heptaldehyde 32.22 



Nitromethane 26.32 



Mercaptan 24.86 



Oleic acid 24.62 



Wc t Spreading liquids S=Wa- Wc 



Heptane 22.40 



Ethyl bromide 17.44 



Chloroform 13.04 



Anisole 11.76 



Phenetole 10.66 



p-Cymene 10.10 



Isopentane 9.44 



Liquids which form lenses S = Wa — Wc 



Ethylene dibromide — 3.19 



Carbon disulfide — 6.94 



Monoiodobenzene — 8.74 



Bromof orm — 9.58 



Liquid petrolatum — 13.64 



* For reference, see footnote 215, p. 632. t Wa, work adhesion; Wc, work of cohesion. 



TABLE 677.— HEATS OF ADSORPTION OF GASES BY CHARCOAL 218 



Gas 



Argon . . . .• 3636 



Nitrogen 3686 



Carbon monoxide 



2le Lewis, Squires, and Broughton, Industrial chemistry of colloidal and amorphous materials, Macmillan 

 Co., 1942. Used by permission of the publishers. 



TABLE 678.— BOND ENERGIES* IN KILOCALORIES PER MOL 2 " 



Covalent bonds 



— C = C- 123 

 >C = C< 100 

 -»C - C<- 59 



►C- O- 



70 



* For the energy per atom, divide these values by the Avogadro number, 6.023 X 10 23 . 

 217 Pauling, Linus, The nature of the chemical bond. Used by permission of the author. 



SMITHSONIAN PHYSICAL TABLES 



