Mobility Gels

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| name=Mobility Gels
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| usedby=*Chell
*ATLAS and P-body
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The '''Mobility Gels''' are special gels used by Aperture Science for testing. Appearing in both single-player and co-op modes of ''Portal 2'', they come in three types the Repulsion Gel, allowing the Test Subject to jump great heights while jumping on it; the Propulsion Gel, allowing the Test Subject to attain great speed; and the Conversion Gel, on which the Test Subject can create Teleportation|portals after coating a surface on which it was previously impossible to create a portal.

==Overview==
Propulsion and Repulsion Gels are a derivative of fiberglass insulation designed to be sweeter and slightly less non-toxic. Cave Johnson makes mention of an additional, unknown element in Repulsion Gel which imparts its special abilities, however, Cave warns test subjects that this element "does not like the human skeleton", the same presumably being true of Propulsion Gel. The gels were originally marketed as a dietary aid, but were quickly pulled from shelves following the disastrous results of their use on humans. The gels were then repurposed as a testing element in Aperture's Test Spheres.

The third gel, Conversion Gel, was developed on impulse by Johnson. He purchased $70 million worth of Moon rocks and turned them into a gel with similar properties to the company's previous two gels. In doing so, he was fatally poisoned by moon dust. The gel, however, proved to be an excellent portal conductor. Cave decided that testing with this gel will somehow give the scientists a cure for Cave's illness.

All three gels share similar properties. They will stick to any solid surface, imparting their properties to that surface. If one type of gel is poured on top of another, it coats the earlier one, removing the properties of the first in favor of its own. The gels immediately wash off in water.

All three gels were left in storage when the old Aperture Laboratories was sealed off. However, the new facility was equipped with pipes to connect to the gel supplies if the old labs were unsealed. This occurs when Chell makes her way out of the facility following Wheatley's betrayal.

==Behind the scenes==

*The Repulsion Gel and Propulsion Gel are based on the paint featured in ''Tag The Power of Paint''. The Sticking Gel|third paint, allowing its user to walk on walls and ceilings, was playtested but ultimately scrapped, although its coding is still present within the game and can be enabled with the correct mods.

==List of appearances==
*''Portal 2'' {{1st}}

{{Technology}}
{{Aperture}}
CategoryAperture Science technology
CategoryPortal 2
CategoryAperture Science testing elements
CategoryMobility Gels