Longest vacuum system

According to Official Guinness Records,

The beams of particles that travel around the accelerator ring at the Large Hadron Collider must operate in a vacuum in order to avoid collisions with gas molecules. In total the LHC contains a vacuum some 54 km long (approx. 33 miles) and is rated as an UHV or Ultra High Vacuum, with 10 times less gas pressure than the almost-vacuum at the surface of the Moon.

For a complete list of 2008 records, please visit 2008 Guinness Records in Switzerland.

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