What is the effect of pressure and temperature on thermal conductivity?

The thermal conductivity of a substance is influenced by both pressure and temperature, though the extent of their effects varies depending on whether the substance is a gas, liquid, or solid.  

For gases, thermal conductivity increases with temperature. As temperature rises, the kinetic energy of gas molecules increases, enhancing their ability to transfer energy through collisions. Pressure has a less significant effect on thermal conductivity ___ _________ ____ _______ _________.
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