enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Potassium - Wikipedia

    en.wikipedia.org/wiki/Potassium

    Potassium is the eighth or ninth most common element by mass (0.2%) in the human body, so that a 60 kg adult contains a total of about 120 g of potassium. [84] The body has about as much potassium as sulfur and chlorine, and only calcium and phosphorus are more abundant (with the exception of the ubiquitous CHON elements). [ 85 ]

  3. Potassium-40 - Wikipedia

    en.wikipedia.org/wiki/Potassium-40

    Potassium-40 (40 K) is a radioactive isotope of potassium which has a long half-life of 1.25 billion years. It makes up about 0.012% (120 ppm ) of the total amount of potassium found in nature. Potassium-40 undergoes three types of radioactive decay .

  4. List of physical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_physical_constants

    1.380 649 × 10 −23 J⋅K −1: 0 [5] Newtonian constant of gravitation: 6.674 30 ... For example, the atomic mass constant is exactly known when ...

  5. Isotopes of potassium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_potassium

    19 K) has 25 known isotopes from 34 K to 57 K as well as 31 K, as well as an unconfirmed report of 59 K. [3] Three of those isotopes occur naturally: the two stable forms 39 K (93.3%) and 41 K (6.7%), and a very long-lived radioisotope 40 K (0.012%) Naturally occurring radioactive 40 K decays with a half-life of 1.248×10 9 years. 89% of those ...

  6. Potassium oxide - Wikipedia

    en.wikipedia.org/wiki/Potassium_oxide

    K 2 O crystallises in the antifluorite structure. In this motif the positions of the anions and cations are reversed relative to their positions in CaF 2, with potassium ions coordinated to 4 oxide ions and oxide ions coordinated to 8 potassium. [6] [7] K 2 O is a basic oxide and reacts with water violently to produce the caustic potassium ...

  7. Effective mass (solid-state physics) - Wikipedia

    en.wikipedia.org/wiki/Effective_mass_(solid...

    where E(k) is the energy of an electron at wavevector k in that band, E 0 is a constant giving the edge of energy of that band, and m * is a constant (the effective mass). It can be shown that the electrons placed in these bands behave as free electrons except with a different mass, as long as their energy stays within the range of validity of ...

  8. Molecular mass - Wikipedia

    en.wikipedia.org/wiki/Molecular_mass

    The molar mass is defined as the mass of a given substance divided by the amount of the substance, and is expressed in grams per mol (g/mol). That makes the molar mass an average of many particles or molecules (potentially containing different isotopes), and the molecular mass the mass of one specific particle or molecule. The molar mass is ...

  9. Potassium sulfide - Wikipedia

    en.wikipedia.org/wiki/Potassium_sulfide

    K 2 S Molar mass: 110.262 g/mol ... Potassium sulfide is an inorganic compound with the formula K 2 S. ... pure K 2 S may be prepared by the reaction of potassium and ...