The most stable known isotope, 269Hs, has a half-life of approximately 9.7 seconds. It is a synthetic element (first synthesised at Hasse in Germany) and radioactive. Hassium is a chemical element with symbol Hs and atomic number 108. If we include man made elements, the densest so far is Hassium.
The densest material found on earth is the metal osmium, but its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. Since nucleons ( protons and neutrons) make up most of the mass of ordinary atoms, the density of normal matter tends to be limited by how closely we can pack these nucleons and depends on the internal atomic structure of a substance. The atomic number density (N atoms/cm 3) of a pure material having atomic or molecular weight (M grams/mol) and the material density (⍴ gram/cm 3) is easily computed from the following equation using Avogadro’s number ( N A = 6.022×10 23 atoms or molecules per mole): The atomic number density (N atoms/cm 3), which is associated with atomic radii, is the number of atoms of a given type per unit volume (V cm 3) of the material. Therefore it is determined by the mass number (number of protons and neutrons). The atomic mass is carried by the atomic nucleus, which occupies only about 10 -12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. Since the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance, it is obvious, the density of a substance strongly depends on its atomic mass and also on the atomic number density (N atoms/cm 3), Density – Atomic Mass and Atomic Number Density The Standard English unit is pounds mass per cubic foot ( lbm/ft 3). The standard SI unit is kilograms per cubic meter ( kg/m 3). In words, the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. It is an intensive property, which is mathematically defined as mass divided by volume: You're wanting to protect your investment by getting touch up paint, so get good and fresh paint.Typical densities of various substances are at atmospheric pressure.ĭensity is defined as the mass per unit volume. No retail dealer or location can possibly store the many colors of paint GM generates across all of its models, year after year - and also have good turnover. You do not want old paint that has been sitting on a shelf for who knows how long. Auto manufacturers are not paint companies and get their paint from OEM manufacturers like MicroFinish. What you do not want to do is buy from GM or a GM Dealer for two reasons.įirst, you will pay a retail markup. Microfinish will make fresh paint just for your Sierra and guarantee a color match. Since they are a manufacturer directly selling to the public they offer wholesale type prices while at the same time providing industry leading quality paint. Microfinish is a high quality manufacturer of OEM paint and able to guarantee their paint color per GMC's color specifications.Īutomotive Touchup sells to body shops and on its website offers offers direct sales to consumers. We suggest MicroFinish AutomotiveTouchup. The best, and most recommended provider, is an OEM specialty paint provider. Showing where places these stickers in its vehicles and samples so you know what to look for.
0 kommentar(er)
