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  2. Barrel (unit) - Wikipedia

    en.wikipedia.org/wiki/Barrel_(unit)

    US dry barrel: 7,056 cubic inches (115.6 litres; 3.3 US bushels) . Defined as length of stave 28 + 1 ⁄ 2 in (72 cm), diameter of head 17 + 1 ⁄ 8 in (43 cm), distance between heads 26 in (66 cm), circumference of bulge 64 in (160 cm) outside measurement; representing as nearly as possible 7,056 cubic inches; and the thickness of staves not greater than 4 ⁄ 10 in (10 mm) [2] (diameter ≈ ...

  3. Standard litre per minute - Wikipedia

    en.wikipedia.org/wiki/Standard_litre_per_minute

    The standard liter per minute (SLM or SLPM) is a unit of (molar or) mass flow rate of a gas at standard conditions for temperature and pressure (STP), which is most commonly practiced in the United States, whereas European practice revolves around the normal litre per minute (NLPM). [1]

  4. Sheet resistance - Wikipedia

    en.wikipedia.org/wiki/Sheet_resistance

    This is an advantage, because sheet resistance of 1 Ω could be taken out of context and misinterpreted as bulk resistance of 1 ohm, whereas sheet resistance of 1 Ω/sq cannot thus be misinterpreted. The reason for the name "ohms per square" is that a square sheet with sheet resistance 10 ohm/square has an actual resistance of 10 ohm ...

  5. Graphene - Wikipedia

    en.wikipedia.org/wiki/Graphene

    Graphene is the only form of carbon (or solid material) in which every atom is available for chemical reaction from two sides (due to the 2D structure). Atoms at the edges of a graphene sheet have special chemical reactivity. Graphene has the highest ratio of edge atoms of any allotrope. Defects within a sheet increase its chemical reactivity ...

  6. Diode - Wikipedia

    en.wikipedia.org/wiki/Diode

    Among many uses, diodes are found in rectifiers to convert alternating current (AC) power to direct current (DC), demodulation in radio receivers, and can even be used for logic or as temperature sensors. A common variant of a diode is a light-emitting diode, which is used as electric lighting and status indicators on electronic devices.

  7. Grand Canyon - Wikipedia

    en.wikipedia.org/wiki/Grand_Canyon

    The Grand Canyon [a] is a steep-sided canyon carved by the Colorado River in Arizona, United States.The Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and attains a depth of over a mile (6,093 feet or 1,857 meters).

  8. Richmond–San Rafael Bridge - Wikipedia

    en.wikipedia.org/wiki/Richmond–San_Rafael_Bridge

    In 1977, Marin County was suffering one of its worst droughts in history. A temporary on-surface pipeline, six miles (9.7 km) long, was placed in the third lane. The pipe transferred 8,000,000 US gallons (30,000,000 L; 6,700,000 imp gal) of water a day from the East Bay Municipal Utility District's mains in Richmond to Marin's 170,000 residents ...

  9. Building-integrated photovoltaics - Wikipedia

    en.wikipedia.org/wiki/Building-integrated...

    Blue devices can convert 13.3% of light absorbed into power, making it the most efficient across all colored devices developed and tested. Perovskite solar cell technology can be tuned to red, green and blue by changing the metallic nanowire thickness to 8, 20 and 45 nm respectively. [ 19 ]