A video by the Lawrence Livermore National Laboratory (LLNL), California, USA regarding an experimental hydrogen car. Source- https://publicaffairs.llnl.gov/news/video_archive.html 'A cryogenic pressure vessel developed and installed in an experimental hybrid vehicle by an LLNL research team can hold liquid hydrogen for six days without venting any of the fuel. Unlike conventional liquid hydrogen (LH_2) tanks in prototype cars, the LLNL pressure vessel was parked for six days without venting evaporated hydrogen vapor. The LLNL development has significantly increased the amount of time it takes to start releasing hydrogen during periods of long-term parking, as compared to todays liquid hydrogen tanks capable of holding hydrogen for merely two to four days.'
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