Didn't EM say it wasn't pressurised? Could be misdirection, mind. | Hacker News

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		bencollier49 on July 18, 2013 \| parent \| context \| favorite \| on: Hyperloop: riding sound’s density peak to exploit ... Didn't EM say it wasn't pressurised? Could be misdirection, mind.

wcoenen on July 18, 2013 | [–]

No, he said that it is "not an evacuated tunnel".

dedward on July 18, 2013 | [–]

The pressure peaks in a sound wave don't really equate to a pressurized tunnel.. just a localized pressure gradient moving at the speed of sound.

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