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At the beginning of the Second World War the British Army was equipped with two simple fuel containers: the 2-imperial-gallon (9.1 L; 2.4 US gal) container made of pressed steel, and the 4-imperial-gallon (18 L; 4.8 US gal) container made from tin plate. The 2-gallon containers were relatively strong, but were expensive to produce.
An ice pack Shipment of vaccine in insulated box with gel packs An ice pack or gel pack is a portable bag filled with water, refrigerant gel , or liquid, meant to provide cooling. They can be divided into the reusable type, which works as a thermal mass and requires freezing, or the instant type, which cools itself down using chemicals but can ...
Fire retardant gel protects a person's hand from a burning fuel. Fire-retardant gels are superabsorbent polymer slurries with a "consistency almost like petroleum jelly." [1] Fire-retardant gels can also be slurries that are composed of a combination of water, starch, and clay.
The result is a solid with extremely low density [4] and extremely low thermal conductivity. Aerogels can be made from a variety of chemical compounds . [ 5 ] [ 6 ] Silica aerogels feel like fragile styrofoam to the touch, while some polymer -based aerogels feel like rigid foams.
Jell-O (stylized in all caps) is an American brand offering a variety of powdered gelatin dessert (fruit-flavored gels/jellies), pudding, and no-bake cream pie mixes. The original gelatin dessert (genericized as jello) is the signature of the brand.
In 2019, the worldwide demand of gelatin was about 620,000 tonnes (1.4 × 10 ^ 9 lb). [23] On a commercial scale, gelatin is made from by-products of the meat and leather industries. Most gelatin is derived from pork skins, pork and cattle bones, or split cattle hides. [ 24 ]
One serving (one-quarter of a box) of dry Jell-O chocolate-flavored instant pudding contains 110 calories, 430 mg sodium, 8 g carbohydrate, 18 g sugars, and 1 g of dietary fiber. [3] It also contains 4% of the daily Recommended Dietary Allowance of iron. [3] Instant pudding mixes are produced in non-fat and sugar-free varieties. [7]
Silica gel was in existence as early as the 1640s as a scientific curiosity. [5] It was used in World War I for the adsorption of vapors and gases in gas mask canisters.The synthetic route for producing silica gel was patented in 1918 by Walter A. Patrick, a chemistry professor at Johns Hopkins University.