Fog
In space and astronautical engineering, fog refers to a phenomenon that occurs when a propellant is cooled below its boiling point, causing it to condense and form a cloud of small droplets or ice crystals. This can occur in rocket engines, where the propellant is often cryogenic and must be kept at very low temperatures to remain in a liquid state. Fog can cause problems for rocket engines, as the droplets or ice crystals can clog fuel lines or damage engine components. Engineers must take precautions to prevent fog from forming, such as using insulation to keep the propellant warm or designing the engine to minimize the amount of cold surfaces that the propellant comes into contact with.
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