600913 Disclosed herein is an agent when used in a heat-transfer fluid of a heat exchange system or a coolant of a cooling system, for enhancing the heat conductivity thereof, comprising a nano-scale powder of a first material and a micro-scale powder of a different second material, wherein each particle of the nano-scale powder having a particle size smaller than 100 nanometers, and each particle of the micro-scale powder having a particle size between 100 nanometers and 500 micrometers. The material may be selected from a group consisting of: a metal, an alloy, a non-metallic material, a metallic compound, and a non-metallic compound wherein: the metal is selected from the group consisting of: titanium, vanadium, chromium, cobalt, nickel, iridium, zirconium, niobium, molybdenum, rhodium, palladium, tantalum, tungsten, platinum, silver and gold

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