Principles of Heat Crossword

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QUESTIONS LIST: Conduction: When heat travels through a solid material, Convection: When heat travels through a liquid or gas, Radiation: When heat travels via infrared light, Kelvin: The scientific unit for measuring heat, Insulation: Used to prevent the ingress of cold or to prevent the loss of heat, Fuel: One of the items needed for combustion, Oxygen: Part of the fire triangle, needed for combustion, Natural: _ _ _ _ _ _ _ - Gas, commonly used in domestic properties for boiler and cooker fuel, Propane: A gas commonly used in blowlamps