- A radioactive element.
- Where audio signals increase and decrease the amplitude of the "carrier wave".
- Abbreviation of attometre a distance of 10-18m.
- The unit of density of a gas at stp equal to 44.614774 molm-3.
- An alloy that contains mercury.
- The acoustic characteristics of a space with regard to reverberation.
- Ambient Environment
- The conditions characterizing the air or other medium that surrounds materiel.
- Ambient Noise
- The composite of airborne sound from many sources near and far associated with a given environment.
- Ambient Temperature
- The average temperature of the surroundings.
- The properties of something that allow it to have more than one possible meaning.
- A continuous aisle in a circular building, as in a church.
- American Chemical Society
- Congressionally chartered independent membership organization which represents professionals at all degree levels and in all fields of chemistry and sciences that involve chemistry.
- American National Standards Institute
- A private, non-profit organisation that produces industrial standards.
- American Petroleum Institute
- National trade association that represents all aspects of America’s oil and natural gas industry.
- American Society For Testing Material
- An open forum for the development of high-quality, market relevant international standards used around the globe.
- American Society of Mechanical Engineers
- Founded in 1880 as the American Society of Mechanical Engineers, today′s ASME promotes the art, science & practice of mechanical & multidisciplinary engineering and allied sciences around the globe.
- American Standard Code for Information Interchange
- Coding for text files.
- American Standard Pipe Thread
- A type of screw or thread, commonly used on pipe fittings to assure a tight seal.
- American Welding Society
- The mission of the American Welding Society is to advance the science, technology and application of welding and allied joining and cutting processes, including brazing, soldering and thermal spraying.
- American Wire Gauge
- A numbering system for standard wire diameters, often abbreviated as AWG.
- A radioactive element. Alpha particle emitter with a half life of 475 years.
- Ames Test
- A simple bacterial test for carcinogens.
- Amicable Numbers
- Two numbers are said to be amicable if each is equal to the sum of the proper divisors of the other.
- The most stable of all the carbonyl functional groups.
- A class of organic compounds in which one or more of the hydrogen atoms of ammonia have been replaced by other groups of atom.
- Aminic Acid
- Another name for Methanoic Acid.
- Amino Acid
- Amino acids are molecules that contain at least one amine group (-NH2) and at least one carboxylic acid group (-COOH).
- Aminoacetic Acid
- A naturally occurring aliphatic amino acid, also known as glycine.
- Alternative name for Aniline.
- Ammann, Othmar Herrmann
- Engineer and designer of numerous long suspension bridges, including the Verrazano-Narrows Bridge over New York harbour.
- Instrument for measuring the current in amps, milliamps or microamps.
- Ammeter Shunt
- A low-resistance conductor, placed in parallel with an ammeter movement, so that most of the current flows through the shunt, and only a small portion flows through the ammeter.
- A metal ion complex containing ammonia as a ligand.
- Obtained from nitrogen using the Haber process and used in the manufacture of fertilizers and explosives.
- Ammonium Acetate
Derived from the reaction of ammonia and acetic acid.
- Ammonium Bicarbonate
Used in the food industry as a raising agent for flat baked goods.
- Ammonium Carbonate
- Ammonium Chloride
A clear white water-soluble crystalline salt with a biting, slightly sour taste.
- Ammonium Fluoride
Crystallizes as small prisms, having a sharp saline taste, and is exceedingly soluble in water.
- Ammonium Hydrogen Carbonate
- Alternative name for Ammonium Bicarbonate.
- Ammonium Hydrogenphosphate
Used as a nutrient for the yeast in brewing.
- Ammonium Hydroxide
- A solution of ammonia in water.
- Ammonium Iodide
Used in photographic chemicals and some medications.
- Ammonium Ion
- NH4+ is a cation formed by neutralization of ammonia, which acts as a weak base.
- Ammonium Nitrate
The most known chemical property of ammonium nitrate is its combustability. This also makes it a very dangerous compound to work with.
- Ammonium Sulphate
Fine granulated, off white or brown crystals. There may be a slight ammonia like odour. Sulphate of ammonia is a chemical fertilizer.
- Organisms which excrete excess nitrogen in the form of ammonia.
- Amor Asteroids
- Have orbits that cross the orbit of Mars and approach Earth′s orbit.
- The branch of science concerned with the determination of amorphous solid structures and their systemmatic classification.
- Non-crystalline, without long-range order.
- Amorphous Semiconductor
- A non-crystalline semiconductor material that has no long range order.
- Amorphous Solar Cell
- These cells are not as efficient as the monocrytalline cells but they do perform better in low light levels.
- Amount of Substance
- The SI unit of the Amount of Substance is the mole.
- The informal name for Ampere.
- The amount of current flow within a circuit, expressed in amps.
- The SI unit of Electric current.
- Ampere Andre Marie
- Permanent place in the history of science because it was his name that was given to the unit by which we measure electrical current.
- Ampere Hour Capacity
- A measurement of storage battery ability to deliver a specified current over a specified length of time.
- Ampere Hour Efficiency
- The ratio of the output of a secondary cell or battery, measured in ampere-hours, to the input required to restore the initial state of charge, under specified conditions.
- Ampere Hour Meter
- An instrument that monitors current over time. The indication is the product of current (amperes) and time (hours).
- An alternative unit of electrical charge.
- Ampere′s Law
- The line integral of the magnetic flux around a closed curve is proportional to the algebraic sum of electric currents flowing through that closed curve.
- The magnetomotive force developed by 1 ampere of current flowing through a coil of one turn.
- Determining the concentration of a material in a sample by measuring electric current.
- The character &
- A prefix used to name certain members of a series of geometric isomers or stereoisomers.
- Amphibolic Pathway
- A metabolic pathway used in both catabolism and anabolism.
- Containing both polar and nonpolar domains.
- Amphiprotic Solvent
- Solvents that exhibit both acidic and basic properties.
- A substance that can act as either an acid or a base in a reaction.
- A special dc generator in which a small dc voltage applied to field windings controls a large output voltage from the generator. In effect, an amplidyne is a rotary amplifier that often times produces gain of approximately 10,000.
- Amplifiers are used to provide a number of functions.
- Amplification Factor
- The voltage gain of an amplifier with no load on the output.
- A circuit or element that provides gain.
- The maximum distance from the equilibrium position that occurs in periodic motion.
- Amplitude Distortion
- A distortion of the wave shape of a signal.
- Amplitude Envelope
- The function describing how the maximum amplitude of a waveform evolves over time.
- Amplitude Flatness
- A measure of how close to constant the gain of a circuit remains over a range of frequencies.
- Amplitude Modulation
- Where audio signals increase and decrease the amplitude of the "carrier wave".
- Amplitude Stability
- The ability of the oscillator to maintain a constant amplitude in the output waveform.
- Defined as one twelfth of the mass of the most abundant isotope of carbon (12C)
- Amyl Alcohol
- The IUPAC name for Butanol.
- Amyl Nitrite
Employed medically to treat heart diseases such as angina and also to treat cyanide poisoning. It is also used as an inhalant drug that induces a brief euphoria.
- A form of starch made of glucose molecules linked in a branching pattern.
- A form of starch made of long, unbranched chains of -D-glucose molecules.
- Another name for starch.