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Electrical appliances that emit infrared radiation are known as infrared lights. Radiant heating for industrial processes and building heating frequently uses infrared lamps. Infrared LEDs are utilised in remote control devices as well as optical fibre communication. Certain night vision equipment that would be uncomfortable with visible light also use infrared lights. Certain scientific and industrial instruments use infrared lamp sources for chemical analysis of liquids and gases; for instance, the infrared absorption characteristics of sulfur dioxide in air can be used to measure the amount of this pollutant.