Word: thermal
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...Solvent extraction," pioneered by Shell, which produces toluene either as it occurs naturally in some gasolines, or as a distillate from the thermal cracking process; 2) catalytic processing ("hydro-forming") of naphthas...
...conducts heat some 200 times better than silver and copper, best thermal conductors hitherto known...
Kenneth T. Bainbridge, Wendell H. Furry, and Otto Oldenberg, to continue experiments on masses and abundances of isotopes, and in particular to separate in quantities isotopes or gas mixtures by thermal diffusion...
...called U-235.- This kind is scarce and extremely difficult to separate from the common isotope, 11-238. So far, not enough U-235 has been isolated to put in a fruit fly's eye. A Swedish scientist was beginning to speed up the process with gadgets called thermal diffusion tubes when the war stopped him. Another line of attack is with centrifuges - whirling machines which work like cream separators...
...next year. It was started by outside power, then fuel was injected. The engine blew up. Diesel was pleased. It had shown him that the heat of compression really was enough to ignite the fuel. Four more years of hard, steady work produced an engine with the highest thermal efficiency of any then in existence...