Gel
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A gel is a semi-solid that can have properties ranging from soft and weak to hard and tough. Gels are defined as a substantially dilute cross-linked system, which exhibits no flow when in the steady s
An upturned vial of hair gel
Silica gel
Hydrogel of a superabsorbent polymer
Aerogel
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aerogel: composed of a microporous solid in which the dispersed phase is a gas.
Gel
…other junctions that remain intact within the extending fluid. Virtually any fluid can be used as an extender including water (hydrogels), oil, and air (aerogel). Both by weight and volume, gels are mostly fluid in composition and thus exhibit densities similar to those of their constituent liquids. Edible jelly…
A block of silica aerogel in a hand.
Aerogel crystals produced in ScCO2 drying
A flower resting on a piece of silica aerogel, which is suspended over a flame from a Bunsen burner. Aerogels have excellent insulating properties, and the flower is protected from the heat of the flame.
A 2.5 kg brick is supported by a piece of aerogel with a mass of 2 g.