Science Source General Science

EN_90286235_0302

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caption

Silica gel used in packaging for a CD player. Silica gel is a granular form of silica, synthetically manufactured from sodium silicate. It has an extremely high porosity, making it a highly effective adsorbent material. The large internal surface area enables each granule to attract and hold moisture through physical adsorbtion and capillary condensation. Packaged in a semi-permeable packet, silica gel is used as a desiccant to keep a variety of packaged goods dry, often used in electronics packaging. Although silica gel is inert and non-toxic, indicator substances are often added to it which change color when moist. These substances are often toxic which is why the packets are usually labeled as such.

headline Science Source General Science

created date 2010-02-13

credit EAST NEWS

source Science Source

byline Mark Burnett

original transmission reference 2x6296

weight 1,02MB

size 19cm x 29cm by 300dpi

keywords - Show

ADDED, ADSORBENT, ADSORBTION, AGENT, ALTHOUGH, AN, AND, ARE, AREA, AS, ATTRACT, BALLS, BEADS, BURNETT, CAPILLARY, CD, CHANGE, CHEMICAL, CHEMISTRY, COLOR, COMPOUND, COMPOUNDS, CONDENSATION, DESICCANT, DESSICANT, DESSICATOR, DIOXIDE, DRY, DRYING, EACH, EFFECTIVE, ELECTRONICS, ENABLES, EXTREMELY, FOR, FORM, FROM, GEL, GOODS, GRANULAR, GRANULE, GRANULES, HAS, HIGH, HIGHLY, HOLD, HORIZONTAL, IN, INDICATOR, INERT, INTERNAL, IS, IT, KEEP, LABELED, LARGE, MAKING, MANUFACTURED, MARK, MATERIAL, MOIST, MOISTURE, NON-TOXIC, OF, OFTEN, PACKAGED, PACKAGING, PACKET, PACKETS, PHYSICAL, PLAYER, POROSITY, PORTABLE, SEMI-PERMEABLE, SILICA, SILICATE, SILICON, SIO2, SODIUM, SUBSTANCES, SUCH, SURFACE, SYNTHETIC, SYNTHETICALLY, THE, THESE, THROUGH, TO, TOXIC, USED, USUALLY, VARIETY, WALKMAN, WHEN, WHICH, WHY,