NH4 or NH 4 or NH-4 may refer to:
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Ammonium
The ammonium cation is a positively-charged polyatomic ion with the chemical formula or . It is formed by the protonation of ammonia (). Ammonium is also a general name for positively charged or protonated substituted amines and quaternary a ...
, the cation NH
4+ in chemistry
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National Highway 4 (India)
National Highway 4, or NH 4, is the major highway in the Indian union territory of Andaman and Nicobar Islands. It is 230.7 km in length. This road running from the capital city of Port Blair to Diglipur connecting all major towns of Ferrar ...
, new numbering for a National Highway in India
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National Highway 4 (India, old numbering), a major National Highway in western and southern India
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New Hampshire Route 4
New Hampshire Route 4 (NH 4) is a state highway located in eastern Strafford County, New Hampshire. Its western terminus is at an intersection with New Hampshire Route 9 and New Hampshire Route 108 in Dover. Its northern terminus is at the Ma ...
, a short state highway located in eastern Strafford County, New Hampshire, United States
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