Principles of Heat Crossword Puzzle

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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