Re: Why does a cap vent?

Years ago while working on tube television chassis inside a wooden console, I saw an aluminum can electrolytic launch the can into the top of the wooden console. It planted itself into the wooden top enough to cause the top of the furniture to require refinishing.
Caps in those televisons were 400+ uf's at up to 600 volts. They became grenades if installed incorrectly. Be very careful about ploarity when installing any cap.