This page contains science-related numbers.

## Edit

**92 (ninety-two)**is the atomic number of uranium, the heaviest primordial element.**94 (ninety-four)**is the atomic number of plutonium, which used to be regarded as the heaviest primordial element.**108**is the atomic number of the element hassium, which had the systematic symbol Uno.- The number
**126**is a magic number in nuclear physics. **128**(one hundred twenty-eight) is the number of protons in both hexamethyltungsten and tungsten hexafluoride, which are gases under standard conditions, the latter being the heaviest known.- The reciprocal of the fine-structure constant is approximately equal to
**137**.- With a leading zero, it is also the German mass traffic telephone number prefix.

- There are exactly
**146**primordial nuclides without energetically allowed alpha or beta (including double beta and electron capture) decay modes. - The isotope dysprosium-
**164**is the heaviest primordial nuclide without energetically allowed alpha or beta (including double beta and electron capture) decay modes. - The isotope lead-
**208**is the heaviest observationally stable nuclide.- There is also a car with this number in the name.

- The isotope bismuth-
**209**used to be regarded as the heaviest observationally stable nuclide. - The isotope uranium-
**238**is the heaviest primordial nuclide. - The isotope plutonium-
**244**used to be regarded as the heaviest primordial nuclide. - The isotope fermium-
**257**is the heaviest nuclide that can be formed by neutron capture from naturally occuring elements.- The number 257 is also a Fermat prime \(2^{2^3}+1\).

- There are exactly
**286**primordial nuclides.- There is also a microprocessor with this number in the name.

- Since samarium-146 and plutonium-244 used to be regarded as primordial nuclides, some sources list
**288**primordial nuclides. - Tungsten hexafluoride is the heaviest known gas under standard conditions. Using the heaviest primordial nuclides of its elements, its molar mass will be approximately equal to 186 + 6 × 19 =
**300**. Since it is also equal to 186 + 6 × 13 + 18 × 2, its hexamethyltungsten analogon has the same molar mass. - The elementary charge is approximately equal to
**1.602**× 10^{−19}coulombs. - The number
**300,000**is used as an approximation for the speed of light, which is equal to 299,792.458 km/s or 299,792,458 m/s. - On July 10, 1976, the most poisonous chemical substance (namely, 2,3,7,8-Tetrachlorodibenzo-p-dioxin) was the cause of the Seveso disaster. The number of possible isotopical isomers of this substance is (2^20*3^2+2^10*3^2+2^10*3+2^10*3)/4, which amounts to
**2,363,136**.- Its prime factorization is 2
^{8}× 3 × 17 × 181.

- Its prime factorization is 2
**299,792,458**is the speed of light in a vacuum, as measured in meters per second. It is usually denoted as \(c\).- Its prime factorization is 2 × 7 × 73 × 293,339.

- The number
**300,000,000**is used as an approximation for the speed of light, which is equal to 299,792,458 m/s. - The radiation emitted by the hyperfine transition in the ground state of caesium-133 makes
**9,192,631,770**oscillations per second.^{[1]}- Its prime factorization is 2 × 3
^{2}× 5 × 7^{2}× 47 × 44,351.

- Its prime factorization is 2 × 3
- The mass–energy equivalence (E=mc
^{2}) implies, that a small mass corresponds to a large energy. For instance, a kilogram corresponds to the energy of**89,875,517,873,681,764**joules.

## Approximations in other notations Edit

Notation | Approximation |
---|---|

Scientific notation | \(2.99792458*10^8\) (exact) |

Arrow notation | \(7 \uparrow 10<n<26 \uparrow 6\) |

Arrow notation (more precise) | \(669 \uparrow 3<n<670 \uparrow 3\) |

Arrow notation (more precise) | \(17,314 \uparrow 2<n<17,315 \uparrow 2\) |

Hyper-E notation | \(3E8\) |

Factorial | \(12!\) |

Fast-growing hierarchy | \(f_2(27)\) |

Hardy hierarchy | \(H_{\omega 18}(24)\) |

Slow-growing hierarchy | \(g_{\omega^8 3}(10)\) |

Notation Array Notation | \((10\{1,3\}8)\) |