A gel (from the lat. gelu—freezing, cold, ice or gelatus—frozen, immobile, 凝胶, 潤滑劑) is a solid, jelly-like material (将Gel译成啫喱膏合适吗?) that can have properties ranging from soft and weak to hard and tough. Gels are defined as a substantially dilute crosslinked system, which exhibits no flow when in the steady-state. By weight, gels are mostly liquid, yet they behave like solids due to a three-dimensional crosslinked network within the liquid. It is the crosslinks within the fluid that give a gel its structure (hardness) and contribute to stickiness (tack).
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