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405.5 K (132.3 °C), 11.300 MPa: Std enthalpy change of fusion, Δ fus H o +5.653 kJ/mol Std entropy change of fusion, Δ fus S o +28.93 J/(mol·K) Std enthalpy change of vaporization, Δ vap H o +23.35 kJ/mol at BP of −33.4 °C Std entropy change of vaporization, Δ vap S o +97.41 J/(mol·K) at BP of −33.4 °C Solid properties Std enthalpy ...
Mesh is a measurement of particle size often used in determining the particle-size distribution of a granular material.For example, a sample from a truckload of peanuts may be placed atop a mesh with 5 mm openings.
Example of calculation of isotropic short-range surface roughness (Trevisani et al., 2023) for an alpine area. The calculation is based on a high resolution digital terrain model (2 m resolution). Many other different aspects and scales of roughness can be described.
The molecule has eight bond lengths ranging between 0.137 and 0.146 nm. Each carbon atom in the structure is bonded covalently with 3 others. [8] The structure of C 70 molecule. Red atoms indicate five hexagons additional to the C 60 molecule. C 70 can undergo six reversible, one-electron reductions to C 6− 70, whereas oxidation is irreversible.
Structure and properties Index of refraction, n D: 1.000449 at 589.3 nm and 0 °C [1]: Dielectric constant, ε r: 1.60 ε 0 at 0 °C, 50 atm : Average energy per C=O bond : 804.4 kJ/mol at 298 K (25 °C) [2]
The radius of Pluto must also be known, but it was poorly constrained before 2015. So, precise values of Pluto's surface pressure were impossible to calculate in previous times. For some occultations since 1988, pressure was calculated for a reference level of 1275 km from the center of Pluto (which later turned out to be 88±4 km from the ...
For example, the mass absorption coefficient of silicon at the wavelength of the aluminium Kα line is 50 m 2 /kg, whereas that of iron is 377 m 2 /kg. This means that fluorescent X-rays generated by a given concentration of aluminium in a matrix of iron are absorbed about seven times more (that is 377/50) compared with the fluorescent X-rays ...
The Titius–Bode law (sometimes termed simply Bode's law) is a formulaic prediction of spacing between planets in any given planetary system.The formula suggests that, extending outward, each planet should be approximately twice as far from the Sun as the one before.