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  2. Warframe - Wikipedia

    en.wikipedia.org/wiki/Warframe

    Warframe is a free-to-play action role-playing third-person shooter multiplayer online game developed and published by Digital Extremes.First released for Windows personal computers in March 2013, it was later ported to PlayStation 4 in November 2013, Xbox One in September 2014, Nintendo Switch in November 2018, PlayStation 5 in November 2020, Xbox Series X/S in April 2021, and iOS in February ...

  3. Free Fire (video game) - Wikipedia

    en.wikipedia.org/wiki/Free_Fire_(video_game)

    Free Fire Max is an enhanced version of Free Fire that was released in 2021. [ 71 ] [ 72 ] It features improved High-Definition graphics , sound effects , and a 360-degree rotatable lobby. Players can use the same account to play both Free Fire Max and Free Fire , and in-game purchases, costumes, and items are synced between the two games. [ 73 ]

  4. Fluoroantimonic acid - Wikipedia

    en.wikipedia.org/wiki/Fluoroantimonic_acid

    Fluoroantimonic acid is a mixture of hydrogen fluoride and antimony penta­fluoride, containing various cations and anions (the simplest being H 2 F + and SbF − 6).This mixture is a superacid stronger than pure sulfuric acid, by many orders of magnitude, according to its Hammett acidity function.

  5. Water-reactive substances - Wikipedia

    en.wikipedia.org/wiki/Water-reactive_substances

    Water-reactive substances are classified as R2 under the UN classification system and as Hazard 4.3 by the United States Department of Transportation. In an NFPA 704 fire diamond's white square, and in similar contexts, they are denoted as "W". The classification of substances as water-reactive is largely a consideration for the safety of ...

  6. Reactive armour - Wikipedia

    en.wikipedia.org/wiki/Reactive_armour

    Reactive armour is a type of vehicle armour used in protecting vehicles, especially modern tanks, against shaped charges and hardened kinetic energy penetrators. The most common type is explosive reactive armour (ERA), but variants include self-limiting explosive reactive armour (SLERA), non-energetic reactive armour (NERA), non-explosive ...

  7. Pyroelectricity - Wikipedia

    en.wikipedia.org/wiki/Pyroelectricity

    Pyroelectricity (from Greek: pyr (πυρ), "fire" and electricity) is a property of certain crystals which are naturally electrically polarized and as a result contain large electric fields. [1] Pyroelectricity can be described as the ability of certain materials to generate a temporary voltage when they are heated or cooled.

  8. Penumbra: Requiem - Wikipedia

    en.wikipedia.org/wiki/Penumbra:_Requiem

    Like the previous games, Requiem is an exploration-based adventure game that takes place from a first-person perspective. Unlike Black Plague and Overture however, the focus is almost exclusively on puzzle solving. No enemies are encountered, meaning that the player can only be injured by environmental hazards.

  9. Praseodymium - Wikipedia

    en.wikipedia.org/wiki/Praseodymium

    Similarly to the other early lanthanides, praseodymium has a double hexagonal close-packed crystal structure at room temperature, called the alpha phase (α-Pr). At 795 °C (1,068 K) it transforms to a different allotrope that has a body-centered cubic structure (β-Pr), and it melts at 931 °C (1,204 K).