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  2. Eye dropper - Wikipedia

    en.wikipedia.org/wiki/Eye_dropper

    They commonly come in 1, 2, 3, and 5 ml which comes with a specific drop size of 10, 20, 25, 35, and 50 μL. [7] The volumes are usually marked on the stem, though the markings are rather crude and are not particularly accurate. [8] A plastic dropper is relatively inexpensive and disposable, so they are often used to avoid cross-contamination.

  3. Test tube rack - Wikipedia

    en.wikipedia.org/wiki/Test_tube_rack

    The racks are most commonly made of metal wires, but they can also be found as plastic, polystyrene, foam, fiberglass, and polypropylene. Test tube racks come in the form of a classic rack, an interlocking cube form, a stack-able form, test tube drying rack, slant rack, and 1-well rack.

  4. Dropping funnel - Wikipedia

    en.wikipedia.org/wiki/Dropping_funnel

    cylindrical type graduated and ungraduated with cone and socket; with pressure equalizing tube; pear shaped, graduated and ungraduated; Pressure-equalizing dropping funnels have an additional narrow-bore glass tube from the bulb of the funnel, to the ground glass joint around the stem.

  5. Storage tank - Wikipedia

    en.wikipedia.org/wiki/Storage_tank

    Tanks built below ground level are sometimes used and referred to as underground storage tanks (USTs). Reservoirs can be covered, in which case they may be called covered or underground storage tanks or reservoirs. Covered water tanks are common in urban areas. Tanks can be mounted on a lorry or an articulated lorry trailer.

  6. Hefty - Wikipedia

    en.wikipedia.org/wiki/Hefty

    The Hefty OneZip sliding tab sealable bag, formerly known as the "rolling-action zipper profile and slipper", was created by Eric A. St. Phillips and F. John Harrington Jr. at Mobil in the early 1990s at a cost of $25 to $50 million, after having developed and evaluated various different zipper designs, and finally deciding to roll out the "boxcar-shaped version", which slides over dual ...

  7. Drop (unit) - Wikipedia

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

    The drop is an approximated unit of measure of volume, the amount dispensed as one drop from a dropper or drip chamber. It is often used in giving quantities of liquid drugs to patients, and occasionally in cooking and in organic synthesis. The abbreviations gt or gtt come from the Latin noun gutta ("drop").

  8. Capacitive power supply - Wikipedia

    en.wikipedia.org/wiki/Capacitive_power_supply

    This way up to 48 white LEDs in series can be powered (for example, 3.1 V/20 mA/20000 mcd). Analyzing the circuit of the lamp shown in the image, at 50 Hz, the 1.2 μF capacitor has a reactance of 2.653 kΩ. By Ohm's law, the current is limited to 240 V/2653 Ω ≈ 90 mA, assuming that voltage and frequency remain constant. The LEDs are ...

  9. Gas holder - Wikipedia

    en.wikipedia.org/wiki/Gas_holder

    30,000 m 3 (1,100,000 cu ft) blast furnace gas holder at Rautaruukki Steel in Finland. A gas holder or gasholder, also known as a gasometer, is a large container in which natural gas or town gas (coal gas or formerly also water gas) is stored near atmospheric pressure at ambient temperatures. The volume of the container follows the quantity of ...

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