What is nitrogen ??????????
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the chemical element of atomic number 7, a colourless, odourless unreactive gas that forms about 78 per cent of the earth's atmosphere. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant.
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An agreement between a wholesaler or retailer and the holder of a brand for the distributor to use that brand exclusively in an area. That is, the wholesaler or retailer is the only company permitted to sell that brand product within certain boundaries.
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