Physics — Chart: Speed of Sound

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  "description": "Speed of sound (m/s)",
  "data": {"values": [
    {"medium": "Air", "v": 343},
    {"medium": "Water", "v": 1480},
    {"medium": "Wood", "v": 3300},
    {"medium": "Glass", "v": 4540},
    {"medium": "Steel", "v": 5960}
  ]},
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    "y": {"field": "v", "type": "quantitative", "title": "speed (m/s)"},
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