Propellendist

Propellendist is a fictional chemical compound featured in the popular video game series "Portal." It is depicted as a highly unstable, volatile substance that serves as a key component in the creation of portals. In the game's lore, propellendist is a synthetic material developed by the Aperture Science laboratory. Its unique properties allow for the instantaneous creation of two interconnected points in space, facilitating teleportation.

The creation and handling of propellendist are central to the gameplay mechanics of "Portal." Players utilize a portal gun that fires propellendist, generating these traversable doorways. The substance itself is described as having a distinct blue or orange hue when solidified and emitted from the portal gun, and it appears to react energetically when in contact with other surfaces. While the exact scientific principles behind propellendist are not explained in detail, it is implied to be an advanced form of exotic matter or a substance that manipulates spacetime in a localized manner.

The narrative of "Portal" often highlights the dangerous and unpredictable nature of propellendist, contributing to the perilous environment of Aperture Science. Its instability is a recurring theme, suggesting that its properties are not fully understood or controlled, even by its creators. This fictional element is crucial to the puzzle-solving and exploration aspects of the game, driving the player's progression through complex test chambers.