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Pure water has a charge carrier density similar to semiconductors [8] [page needed] since it has a low autoionization, K w = 1.0×10 −14 at room temperature and thus pure water conducts current poorly, 0.055 μS/cm. [9] Unless a large potential is applied to increase the autoionization of water, electrolysis of pure water proceeds slowly ...
The refractive index of water at 20 °C for visible light is 1.33. [1] The refractive index of normal ice is 1.31 (from List of refractive indices ). In general, an index of refraction is a complex number with real and imaginary parts, where the latter indicates the strength of absorption loss at a particular wavelength.
Energy densities table. Storage type. Specific energy ( MJ /kg) Energy density (MJ/ L ) Peak recovery efficiency %. Practical recovery efficiency %. Arbitrary Antimatter. 89,875,517,874. depends on density.
A type Ia supernova explosion gives off 1– 2 × 10 44 joules of energy, which is about 2.4–4.8 hundred billion yottatons (24–48 octillion (2.4– 4.8 × 10 28) megatons) of TNT, equivalent to the explosive force of a quantity of TNT over a trillion (10 12) times the mass of the planet Earth.
Table of explosive detonation velocities. This is a compilation of published detonation velocities for various high explosive compounds. Detonation velocity is the speed with which the detonation shock wave travels through the explosive. It is a key, directly measurable indicator of explosive performance, but depends on density which must ...
List of refractive indices. Refraction at interface. Many materials have a well-characterized refractive index, but these indices often depend strongly upon the frequency of light, causing optical dispersion. Standard refractive index measurements are taken at the "yellow doublet" sodium D line, with a wavelength (λ) of 589 nanometers .
The Planck constant, or Planck's constant, denoted by ,[ 1] is a fundamental physical constant [ 1] of foundational importance in quantum mechanics: a photon 's energy is equal to its frequency multiplied by the Planck constant, and the wavelength of a matter wave equals the Planck constant divided by the associated particle momentum.
Photon energy is often measured in electronvolts. To find the photon energy in electronvolt using the wavelength in micrometres, the equation is approximately = since / = 1.239 841 984... × 10 −6 eV⋅m where h is the Planck constant, c is the speed of light, and e is the elementary charge.