Na
- Na
- Sodium is a soft, silvery coloured metal which, like other members of the alkali group of metals, is extremely reactive.
- Na2O
- Chemical formula for Sodium Oxide.
- Na2O2
- Chemical formula for Sodium Peroxide.
- NaBr
- Chemical formula for Sodium I Bromide.
- NACA
- Abbreviation of National Advisory Committee for Aeronautics.
- NaCl
- Chemical formula for quartz.
- Nadir
- The point on the celestial sphere directly below an observer, diametrically opposite the zenith.
- NaF
- Chemical formula for Sodium I Fluoride.
- Nagel Point
- In a triangle, the lines from the vertices to the points of contact of the opposite sides with the excircles to those sides meet in a point called the Nagel point.
- NaH
- Chemical formula for Sodium Hydride.
- NaI
- Chemical formula for Sodium I Iodide.
- Nail Hammer
- A hammer designed to hit the head of nails and usually has a claw device which allows for the removal of nails.
- Nameplate Rating
- The full-load continuous rating of a generator or other electrical equipment under specified conditions as designated by the manufacturer, and written on the nameplate.
- Nand Gate
- Gate whose output is 0 when both input are 1 and 1 in all other cases.
- nano
- Prefix representing a multiplication of 10-9. From the ancient Greek word "nanos" or "dwarf".
- NaNO3
- Chemical formula for Sodium Nitrate.
- nanoampere
- One billionth of an ampere.
- Nanometre
- Abbreviated as nm, unit of length equal to 10-9 metres, and equal to 10 Å (Angstroms).
- Nanosecond
- One billionth of a second, 10-9 s.
- nanovolt
- One billionth of a volt.
- NaO2
- Chemical formula for Sodium I Oxide.
- NaO3Si
- Chemical formula for Sodium Silicate.
- NaOCl
- Chemical formula for Sodium Hypochlorite.
- NaOH
- Chemical formula for Sodium Hydroxide.
- Naphtha
- Volatile solvent distilled from petroleum.
- Naphthyleneethylene
- Another name for Acenaphthene.
- Napierian Logarithm
- Another name for the Natural or Common Logarithm.
- Narthex
- An enclosed passage from the nave to the main entrance of a church.
- NASA
- Abbreviation of National Aeronautics and Space Administration.
- National Advisory Committee for Aeronautics
- Formed on March 3, 1915, with a charter to supervise and direct the scientific study of the problems of flight, with a view to their practical solution.
- National Aeronautics and Space Administration
- NASA was formed from the National Aeronautics and Space Act of 1958.
- National Electrical Code
- The most commonly referenced general electrical standard in the United States.
- National Institute for Standards and Technology
- An agency within the US department of commerce that promotes economic growth through the application of technology, measurement and standards.
- National Physical Laboratory
- National measurement standards laboratory for the UK.
- Nato Alphabet
- Used when communicating over the radio to ensure there is no miscommunication of important information.
- Natrium
- Latin for sodium, hence the symbol Na.
- Natural Abundance
- The average fraction of atoms of a given isotope of an element on Earth.
- Natural Base of Logarithms
- e = 2.71828…
- Natural Frequency
- The frequency of free vibration of a system.
- Natural Gas
- The cleanest fossil fuel, and hence a potential short-term aid to slowing climate change.
- Natural Gas Distribution System
- This term generally applies to mains, services, and equipment that carry or control the supply of natural gas from a point of local supply, up to and including the sales meter.
- Natural Gas Vehicle
- Vehicles that are powered by compressed or liquefied natural gas.
- Natural Heat
- A term that has generally referred to the heat produced within the body, usually the heat produced by the heart and the circulatory system.
- Natural Heat Convection
- If the flow of gas away from a hot object starts by itself it is called natural convection. However, if the gas is forced past the object it is called forced convection.
- Natural Horizon
- The line-of-sight horizon.
- Natural Law
- Natural laws summarize patterns that recur in a large amount of data.
- Natural Logarithm
- Logarithm in which the base is e.
- Natural Number
- Any one of the numbers 1, 2, 3, 4, 5, ..
- Naturally Aspirated
- An engine that draws air in without the assistance of a supercharger or turbocharger.
- Nautical Chain
- A unit of length equal to 15 feet.
- Nautical Mile
- The average distance on the earth's surface subtended by one minute of latitude.
- Naval Brass
- A brass made with 60% copper 40% zinc with 1% tin added for extra corrosion resistance.
- Nave
- The principal area of a church, extending from the main area to the transept.
- Navier Stokes Equation
- The primary equation of computational fluid dynamics, relating pressure and external forces acting on a fluid to the response of the fluid flow.