{
  "title": "Speed of sound and tube resonances in air, heliox and helium",
  "description": "Speed of sound and the first three resonances of a 17 cm tube closed at one end, for dry air, two heliox mixes and pure helium at 20 °C, computed from the ideal-gas formula with each constant's source; plus two values stated by Reber et al. 2015 for comparison.",
  "license": "CC BY 4.0",
  "license_url": "https://creativecommons.org/licenses/by/4.0/",
  "creator": "Tricks of Ear and Eye",
  "page": "https://tricksofearandeye.com/sound/helium-voice/",
  "derived_from": [
    "Computed by Tricks of Ear and Eye: c = sqrt(gamma R T / M) and f_n = (2n-1) c / 4L with L = 0.17 m, constants cited row by row"
  ],
  "method": "Compiled by Tricks of Ear and Eye from the data listed",
  "data_credit": [
    "Constants from Moldover et al. 1988 (public domain), Yue, Dong & Qi 2025 (CC BY 4.0) and Al-Raeei & El-Daher 2020 (CC BY 4.0); heliox mixes and stated values from Fitch et al. 2025 (CC BY 4.0) and Reber et al. 2015 (CC BY 3.0)"
  ]
}