absorbent filter
21Sound — /sownd/, n. The, a strait between SW Sweden and Zealand, connecting the Kattegat and the Baltic. 87 mi. (140 km) long; 3 30 mi. (5 48 km) wide. Swedish and Danish, Oresund. * * * I Mechanical disturbance that propagates as a longitudinal wave… …
22Gas mask — A gas mask is a mask worn over the face to protect the wearer from inhaling airborne pollutants and toxic materials. The mask forms a sealed cover over the nose and mouth, but may also cover the eyes and other vulnerable soft tissues of the face …
23Color printing — Color separation redirects here. For other uses, see Chroma key. Color printing or Colour printing is the reproduction of an image or text in color (as opposed to simpler black and white or monochrome printing). Any natural scene or color… …
24Activated alumina — is manufactured from aluminium hydroxide by dehydroxylating it in a way that produces a highly porous material; this material can have a surface area significantly over 200 square metres/g. The compound is used as a desiccant (to keep things dry… …
25Loudspeaker measurement — is one of the most difficult aspects of audio quality measurementFact|date=March 2008, and also probably the most relevant, since loudspeakers have long been generally acknowledged to be the weak link in the audio chainFact|date=March 2008.… …
26Marine pollution — While marine pollution can be obvious, as with the marine debris shown above, it is often the pollutants that cannot be seen that cause most harm. Marine pollution occurs when harmful, or potentially harmful effects, can result from the entry… …
27sponge — spongeless, adj. spongelike, adj. spongingly, adv. /spunj/, n., v., sponged, sponging. n. 1. any aquatic, chiefly marine animal of the phylum Porifera, having a porous structure and usually a horny, siliceous or calcareous internal skeleton or… …
28Métolachlore — Général Nom IUPAC 2 chloro N (2 éthyl 6 méthylphényl) N (1 méthoxypropan 2 yl)acétamide No CAS …
29Litter box — Cat box redirects here. For the nucleotide sequence in molecular biology, see CAAT box. Kitty litter redirects here. For the safety area in motorsports racing, see run off area. A basic litter box and a bag of litter. A litter box, sometimes… …
30Timeline of Islamic science and engineering — This timeline of Islamic science and engineering covers the general development of science and technology in the Islamic world during the Islamic Golden Age, usually dated from the 7th to 16th centuries.From the 17th century onwards, the advances …
