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  2. Energy density - Wikipedia

    en.wikipedia.org/wiki/Energy_density

    A 1 inch tall uranium fuel pellet is equivalent to about 1 ton of coal, 120 gallons of crude oil, or 17,000 cubic feet of natural gas. [15] In light-water reactors , 1 kg of natural uranium – following a corresponding enrichment and used for power generation– is equivalent to the energy content of nearly 10,000 kg of mineral oil or 14,000 ...

  3. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    For one cycle, they rotate 1/2, 1/4, and 1/12 of a revolution. . The 1/2-turn shaft carries (for each column) gears with 12, 14, 16, and 18 teeth, corresponding to digits 6, 7, 8, and 9. The 1/4-turn shaft carries (also, each column) gears with 12, 16, and 20 teeth, for 3, 4, and 5. Digits [1] and [2] are handled by 12 and 24-tooth gears on the ...

  4. Building insulation - Wikipedia

    en.wikipedia.org/wiki/Building_insulation

    The effectiveness of bulk insulation is commonly evaluated by its R-value, of which there are two – metric (SI) (with unit K⋅W −1 ⋅m 2) and US customary (with unit °F⋅ft 2 ⋅h/BTU), the former being 0.176 times the latter numerically, or the reciprocal quantity the thermal conductivity or U-value W⋅K −1 ⋅m −2.

  5. Iron - Wikipedia

    en.wikipedia.org/wiki/Iron

    Fe 2 O 3 + 2 Al → 2 Fe + Al 2 O 3. Alternatively pig iron may be made into steel (with up to about 2% carbon) or wrought iron (commercially pure iron). Various processes have been used for this, including finery forges, puddling furnaces, Bessemer converters, open hearth furnaces, basic oxygen furnaces, and electric arc furnaces. In all cases ...

  6. Google - Wikipedia

    en.wikipedia.org/wiki/Google

    The same December, it was announced that a $1 billion, 1,700,000-square-foot (160,000 m 2) headquarters for Google would be built in Manhattan's Hudson Square neighborhood. [ 287 ] [ 288 ] Called Google Hudson Square, the new campus is projected to more than double the number of Google employees working in New York City.

  7. M16 rifle - Wikipedia

    en.wikipedia.org/wiki/M16_rifle

    The rifle itself is offered in two variants: the S-5.56 A1 with a 19.9-inch barrel and 1:12 pitch rifling (1 turn in 305 mm), optimized for the use of the M193 Ball cartridge; and the S-5.56 A3 with a 20-inch barrel and a 1:7 pitch rifling (1 turn in 177, 8 mm), optimized for the use of the SS109 cartridge.

  8. Monopole antenna - Wikipedia

    en.wikipedia.org/wiki/Monopole_antenna

    [3] [4] Monopoles shorter than one-quarter wavelength, called electrically short monopoles are also widely used since they are more compact. Monopoles five-eights (5/8 = 0.625) of a wavelength long are also common, because at this length a monopole radiates a maximum amount of its power in horizontal directions.

  9. Comparison of the AK-47 and M16 - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_the_AK-47...

    An M203 grenade launcher adds 1.4 kg (3 lb) to an M16's weight [231] and 40×46mm High Explosive (HE) grenades weigh 0.24 kg (0.53 lb), [232] about half the weight of a loaded M16 magazine. [ 128 ] Video of U.S. troops using GREM (Simon) rifle grenade system