NOVELTY - Heat-conducting fluid comprises (a) 1-20 wt.% of e.g. colemanite, borax, borax pentahydrate, datolite, inyoite, priceite, ulexite, boracite, hydroboracite, tunellite, veatchite, terrugite, rivadavite, sborgite, ezcurrite, nobleite, gowerite, frolovite, meyerhofferite, tertschite, ginorite, pinnoite and kaliborite; and (b) 80-99 wt.% of e.g. carbon dioxide, chlorodifluoromethane, trifluoromethane, difluoromethane, hexafluoroethane, and 1,1,1-trifluoroethane and/or its derivatives, homologous or other gases, where the heat transfer takes place without adding auxiliary energy.    USE - Used as heat-conducting fluid.    ADVANTAGE - The fluid more efficiently transfers the thermal heat from one or more heat sources from one position to another position without using additional auxiliary energy. The fluid has higher coefficient of thermal conduction and allows a quick, homogeneous heat distribution in the respective system.    DETAILED DESCRIPTION - Heat-conducting fluid comprises (a) 1-20 wt.% of colemanite, borax, borax pentahydrate, datolite, inyoite, priceite, ulexite, boracite, hydroboracite, magnesium borate hydroxide (MgBO3(OH) or MgBO2(OH)), aluminium-silicon group of formula (Mx/n((AlO2)x(SiO2)y)ZH2O), tunellite, veatchite, terrugite, rivadavite, sborgite, ezcurrite, nobleite, gowerite, frolovite, meyerhofferite, tertschite, ginorite, pinnoite, kaliborite, loesserite, inderborite, larderellite, ammonioborite, p-veatchite, veatchite, teepleite, bandylite, hilgardite, fluoborite, berborite, suseksit, seamanite, wiserite, luneburgite, cahnite, sulfoborite, boric acid, jeremejevite, magnesium borate, nordenskioldine, rhodizite, varvikit, ludwigite, pinakiolite, hulsite, avogadrite, sodium fluoroborate, bakerite, cappelenite, danburite, dumortierite, grandidierite, homilite, howlite, hyalotekite, prismatine, manandonite, searlesite, serendibite, tritomite, ammonium pentaborate octahydrate, uralborite, sborgite, pentahydroborite, boric acid, kaliborite, kalborsite, hydroxylborite, hydrochlorborite, hydroboracite, hexahydroborite, carboborite, calcium metaborate, aluminum-silicon-boron-oxygen group of formula (Al(4.5)SiB(0.5)O(9.5)), lithium-aluminum-fluoro-boron-aluminum-silicon group of formula (Li(1-1.5)Al(4-3.5)(OH, F)8((B,Al)Si3O10)), borcarite, boralsilite, boracite or berborite; and (b) 80-99 wt.% of carbon dioxide, chlorodifluoromethane, trifluoromethane, difluoromethane, hexafluoroethane, 1,1,1,2-tetrafluoroethane, chlorodifluoroethane, 111-trifluoroethane, dimethyl-2,2-propane, ethylene, propylene, ethane, octafluoropropane, heptafluoropropane, 1,1,1,3,3,3-hexafluoropropane, 1,1,1,2,2-pentafluoropropane, butane, pentafluoroethane, propane, difluoro-1,1-ethane, sum of 44 wt.% of pentafluoroethane, 4 wt.% of tetrafluoroethane and 52 wt.% of trifluoro-1,1,1-ethane, 23 wt.% of difluoromethane and 25 wt.% of pentafluoroethane, 15 wt.% of difluoromethane, 15 wt.% of pentafluoroethane and 70 wt.% of tetrafluoroethane, or 7 wt.% of pentafluoroethane and 46 wt.% of trifluoro-1,1,1-ethane and 47 wt.% of monochloro difluoro methane, or 60 wt.% of monochloro difluoro methane, 25 wt.% of chloro-1,2,2,2-tetrafluoroethane and 15 wt.% of chlorodifluoroethane, or 50 wt.% of difluoromethane and 50 wt.% of pentafluoroethane, 50 wt.% of pentafluoroethane and 50 wt.% of trifluoro-1,1,1-ethane, 46 wt.% of trifluoromethane and 54 wt.% of hexafluoroethane, 65.1 wt.% of pentafluoroethane and 35.1 wt.% of 1,1,1,2-tetrafluoroethane, 3.4 wt.% of butane, 88 wt.% of 1,1,1,2-tetrafluoroethane, 9 wt.% of octafluoropropane, 3 wt.% of butane, 78.5 wt.% of 1,1,1,2-tetrafluoroethane, 19.5 wt.% of pentafluoroethane, 1.4 wt.% of butane, 0.6 wt.% of pentane, 46.6 wt.% of pentafluoroethane, 50 wt.% of tetrafluoroethane, 3.4 wt.% of butane, 85.1 wt.% of pentafluoroethane, 11.5 wt.% of tetrafluoroethane, 3.4 wt.% of butane, 86 wt.% of pentafluoroethane, 9 wt.% of octafluoropropane or 5 wt.% of propane and/or its derivatives, homologous or other gases, where the heat transfer takes place without adding auxiliary energy.    x, n, y, Z = not defined.