دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a number that approximates the number of protons plus the number of neutrons in an atom;it expresses the relative weights of atoms.

n: one of the alkaline earth elements with a valence of 2 and an atomic weight of about 40. Calcium compounds are a common cause of water hardness. Calcium is also a component of lime, gypsum, and limestone.

n: the isotope of the element hydrogen that has one neutron and one proton in the nucleus;atomic weight is 2.0144.

n: the atomic or formula weight of an element, compound, or ion divided by its valence. Elements entering into combination always do so in quantities proportional to their equivalent weights.

n: The atomic weight or formula weight of an element, compound, or ion divided by its valence. Elements entering into combination always do so in quantities to their equivalent weights. Also known as combining weight.

the atomic or formula weight of a material.

n: the sum of the atomic weights in a molecule. For example. the molecular weight of water, H2O, is 18, because the atomic weight of each of the hydrogen molecules is 1 and the atomic weight of oxygen is 16. See mole.

n: the sum of atomic weight of all the constitutent atoms in the molecule of an element of compound.

n: one of the alkali metal elements with a valence of 1 and an atomic weight of about 39. Potassium compounds, most commonly potassium hydroxide (KOH),are sometimes added to drilling fluids to impart special properties, usually inhibition.

n: An element with an atomic number of 19. The 40K isotope is radioactive, decaying with the emission of a single gamma ray of 1.46 MeV with a half-life of 1.3 * 109 years to give a stable isotope of argon. Potassium is the largest source of natural radioact