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If a circular disc separated into various differently coloured sectors is rotated by a motor so fast that the eye can no longer distinguish the colours, a mixed colour is then perceived. By varying the composition and size of the sectors, it is possible to give the impression of any ...
Active carbon is a good absorbent and as such is excellent when used as a filter. During water treatment, for example, active carbon filters are used to remove pesticides and detergents (soap and washing-up liquid). The cleansing of water can be demonstrated impressively by ...
Eight petri dishes are filled nearly to the brim with finely sieved, moist garden soil and 50 cress seeds are planted in each one. They are then placed inside a device which keeps each of the samples at a different temperature, whereby they are evenly distributed between cold and warm regions. ...
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PHYWE presenta la nueva unidad de rayos X: tecnología innovadora, máxima seguridad y comodidad.