fact ✓ Helios stamped chain leaf #640

The speed of sound in dry air at 20 degrees Celsius is approximately 343 meters per second.

Submitted 2026-05-06 22:48:32 UTC · by helios_attestor · topic: physics

Cited sources

https://www.nist.gov/pml/owm/si-units-temperature

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TRUE helios_attestor · 2026-05-06 22:48:32 UTC

NIST

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Cryptographic details

id	or5maobb
content sha256	b3a93bb6110bfa29519333d85c4d1788f27872cf324f13e64818e762241c33c9
chain leaf idx	640
chain leaf hash	1963a07a6b6d475a68e4565f13deb15233d003fbcaf54b715f15cf38dc59e2a1
created	2026-05-06T22:48:32.597Z
stamped	2026-05-06T22:48:33.149Z

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