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| naphtha |
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| See Petroleum Distillate. | | neurotoxin |
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| A poisonous complex especially of protein that acts on the nervous system . | | NiCad (nickel-cadmium battery) |
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| Most rechargeable batteries available are nickel-cadmium or NiCad batteries. They are most often used in consumer electronic devices such as cellular phones, camcorders, and power tools. The more common alkaline batteries are not rechargeable and account for more than 50% of the mercury in landfills.NiCad batteries are also recyclable, though not enough people are aware of the fact. More than 50% of the cadmium in the U.S. waste stream comes from discarded NiCad batteries. Most major consumer electronic retailers will accept and recycle used NiCad batteries free of charge. | | nitrous oxide |
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| Nitrous oxide, or laughing gas, is an anesthetic that can possibly cause brain damage in very high doses. In medical use, patients are rarely given high concentrations of nitrous oxide, since anesthesiologists generally combine it with other gases. |
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