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Rubber bulbs are used in chemistry laboratories, by placing them on top of a glass or plastic tube. It serves as a vacuum source for filling reagents through a pipette or pasteur pipette and also help control the flow of liquid from the dropping bottle. [1] By using rubber bulb, the contact of the mouth to the chemicals can be avoided.
When such phase-out programs began CFL and especially LED bulb prices were substantially higher than incandescent prices and made the up-front cost a barrier to entry to many consumers [161] despite the superior life-cycle cost of CFL and LED bulbs. [162] Prices of CFLs and especially LEDs have since fallen making those bulbs more accessible to ...
It is mandated in ensuring the safety of life and property at sea, preventing and combating of pollution of the marine environment by ships and promotion of the Republic’s maritime interests. It was established on 1 April 1998 as a result of the South African Maritime Safety Authority Act 5 of 1998.
The 2023 South African National Shutdown was a protest held by the political party Economic Freedom Fighters on 20 March 2023, the day before Human Rights Day. [ 8 ] [ 4 ] [ 9 ] [ 10 ] [ 11 ] The EFF called for the resignation of President Cyril Ramaphosa and an end to load-shedding .
20 March – South Africa prepares for a "nationwide shutdown" as the military is deployed ahead of protests by the Economic Freedom Fighters. [8] 2 June – In February 2023, South Africa experienced a cholera outbreak that grew from 2 initial cases to 99 confirmed cases in Tshwane over the following months. Jubilee Hospital reported 17 deaths ...
Modern flame safety lamp used in mines, manufactured by Koehler. A safety lamp is any of several types of lamp that provides illumination in places such as coal mines where the air may carry coal dust or a build-up of flammable gases, which may explode if ignited, possibly by an electric spark. Until the development of effective electric lamps ...
A small pipette allows for more precise measurement of fluids; a larger pipette can be used to measure volumes when the accuracy of the measurement is less critical. Accordingly, pipettes vary in volume, with most measuring between 0 and 25.0 millilitres (0.00 and 0.88 imp fl oz; 0.00 and 0.85 US fl oz). [2]
(These are for Class A pipettes; Class B pipettes are given a tolerance of twice that for the corresponding Class A.) A specialized example of a volumetric pipette is the microfluid pipette (capable of dispensing as little as 10 μL) designed with a circulating liquid tip that generates a self-confining volume in front of its outlet channels. [3]
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