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QI: umat is the scientific explanation for the decrease in thermal conductivity with an increase in temperature? Additionally, please clarifr thermal conductivity increases again after reaching 22000C, as the figure attached (please explain each stage separately). 4m tax' 2a 22m 24m 2 32M Figure I. Thermal conductivity of 95 % dense t,'O: as a function of temperature 13] How does heat transfer from a hot solid body to another cold solid body? What is the benefit of high thermal conductivity for nuclear fuel (uranium dioxide)?