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    "Pipe period T = 2L/c; c is a given celerity, not Korteweg–Hall from K, D, e, E",
    "Sudden-closure Joukowsky applies when valve time t < T; this page computes T, not Δp",
    "Not Joukowsky Δp=ρcΔv, not Darcy f, not minor-loss K, not Q=Av"
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  "limitations": [
    "Pipe period T = 2L/c; c is a given celerity, not Korteweg–Hall from K, D, e, E",
    "Sudden-closure Joukowsky applies when valve time t < T; this page computes T, not Δp",
    "Not Joukowsky Δp=ρcΔv, not Darcy f, not minor-loss K, not Q=Av"
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    "dP/dV/ρ, K/D/e/E, f/Re, n, A/Q, v → MIXED_INPUT_ENCODING",
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      "title": "ISO 80000-4 — Mechanics",
      "section": "Length, time, speed",
      "supports": "L is a length; T is a time; c is a speed",
      "kind": "standard"
    },
    {
      "title": "Wylie, E.B. and Streeter, V.L. Fluid Transients",
      "section": "Pipe period 2L/a",
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