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  2. List of DIN standards - Wikipedia

    en.wikipedia.org/wiki/List_of_DIN_standards

    Clay masonry units – Part 5: Lightweight long-hole brick and light long-hole brick panels: Active: DIN V 105-6: Clay masonry units – Part 6: High precision units: Active: DIN V 105-100: Clay masonry units – Part 100: Clay masonry units with specific properties: Active: DIN 125: Washers; medium type, primarily for hexagon bolts: Withdrawn ...

  3. Chloromethane (data page) - Wikipedia

    en.wikipedia.org/wiki/Chloromethane_(data_page)

    Standard molar entropy, S o solid? J/(mol K) Heat capacity, c p? J/(mol K) Liquid properties Std enthalpy change of formation, Δ f H o liquid –86.37 kJ/mol at 25 °C Standard molar entropy, S o liquid: 140.08 J/(mol K) Heat capacity, c p: 81.2 J/(mol K) at 15 °C Gas properties Std enthalpy change of formation, Δ f H o gas –83.68 kJ/mol ...

  4. Ballistic conduction - Wikipedia

    en.wikipedia.org/wiki/Ballistic_conduction

    In particular, for surfaces with high fractal dimension contact spots may be very small. In such cases, when the radius of the contact spot is smaller than the mean free path of electrons λ {\displaystyle \lambda } , the resistance is dominated by the Sharvin mechanism, in which electrons travel ballistically through these micro-contacts with ...

  5. Relative permittivity - Wikipedia

    en.wikipedia.org/wiki/Relative_permittivity

    It is still commonly used, but has been deprecated by standards organizations, [15] [16] because of its ambiguity, as some older reports used it for the absolute permittivity ε. [15] [18] [19] The permittivity may be quoted either as a static property or as a frequency-dependent variant, in which case it is also known as the dielectric function.

  6. R-value (insulation) - Wikipedia

    en.wikipedia.org/wiki/R-value_(insulation)

    In most countries the properties of specific materials (such as insulation) are indicated by the thermal conductivity, sometimes called a k-value or lambda-value (lowercase λ). The thermal conductivity (k-value) is the ability of a material to conduct heat; hence, the lower the k-value, the better the material is for insulation.

  7. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    13 cm = 1.3 dm – body length of a Goliath birdeater; 15 cm = 1.5 dm – approximate size of largest beetle species; 19 cm = 1.9 dm – length of a banana; 26.3 cm = 2.6 dm – length of average male human foot; 29.98 cm = 2.998 dm – distance light in vacuum travels in one nanosecond; 30 cm = 3.0 dm – maximum leg length of a Goliath birdeater

  8. Wikipedia:Reference desk/Archives/Science/December 2005 ...

    en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

    Any conductive material, if wrapped around the appliance without large holes, forms a Faraday cage that blocks low-frequency electromagnetic radiation. The maximum allowable hole size depends on the highest frequency that needs to be blocked. —Ilmari Karonen 16:55, 1 December 2005 (UTC)

  9. Cobalt - Wikipedia

    en.wikipedia.org/wiki/Cobalt

    Cobalt extracted from small Congolese artisanal mining endeavors in 2007 supplied a single Chinese company, Congo DongFang International Mining. A subsidiary of Zhejiang Huayou Cobalt, one of the world's largest cobalt producers, Congo DongFang supplied cobalt to some of the world's largest battery manufacturers, who produced batteries for ...