Question: Any idea what chemical substance is used in the fire extinguisher? I initially assumed it couldn't be straightforward liquid H2O as I couldn't see any spherical droplets floating around, but could it be an aerosol?
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Answer: A quick internet search revealed that the International Space Station uses both carbon dioxide and water-based foam extinguishers. The Space Shuttle used Halon 1301 fire extinguishers, but these were fixed nozzles built into the shuttle compartments.