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Why we have a love-hate relationship with electric scooters Some cities are rolling out ambitious electric scooter sharing schemes, while others have banned them outright. Just how green, and how safe, are e-scooters? You might have…
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The continuous flowmeter Flow meters are classed as volumetric or inferential, the latter term referring to meters that determine velocity from other variables such as pressure differences across a device such as an orifice plate. There is a large…
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Lipsticks: How They Have Changed and Where They Are Going Lipstick is arguably the most enduring of cosmetic products. Both women and men have colored their cosmetics for lip at various times throughout the ages—though the practice fell in and out…
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Ultraviolet Light Fights New Virus In the fight against the coronavirus disease 2019 (COVID-19) pandemic, an old weapon has re-emerged . More than a century after Niels Finsen won the 1903 Nobel Prize for discovering that ultraviolet (UV) light…
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Ball Valve - How They Work A ball valve is a shut off valve that controls the flow of a liquid or gas by means of a rotary ball having a bore. By rotating the ball a quarter turn (90 degrees) around its axis, the medium can flow through or is…
