Corrected entry: At the end of the film Ripley uses her acidic blood to burn a hole in the ships glass window the problem is, as any High School Chemistry student will know, acid doesn't react with glass.
Phoenix
6th Aug 2004
Alien Resurrection (1997)
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Correction: The acidic blood of the Aliens is never scientifically described onscreen, only compared to highly acidic substances. Because this is an alien biology, it could have an acid-like caustic effect without actually composing what a chemist would describe as an acid. For example, the blood could contain omnivorous microorganisms that consume substances other than the Aliens - it's possible that these could destroy glass as acid does not. Remember, in the first Alien movie, the facehugger, "It secreted an acid that "burned" through Kane's helmet glass."
Phoenix
Hydrofluoric acid does react with glass, conceivably the blood could be partially composed of that.
dizzyd
Was it ever mentioned that the windows were made of glass and not of some transparent plastic?