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Thermal conductivity refers to how well a material conducts or transfers heat. It measures how quickly thermal energy can move through a substance.
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Insulator: A material that has low thermal conductivity and does not allow heat to pass through easily.
Specific Heat Capacity: The amount of heat energy required to raise the temperature of a substance by a certain amount.
When two objects or substances reach the same temperature and there is no net flow of heat between them.