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For Students · Blast Standoff

Blast Standoff for a wildfire

Built for students learning it for a class or exam. See the concept move instead of memorizing formulas — and check your homework intuition. Simulate a wildfire live below — adjust the inputs and watch it respond, right in your browser.

Blast Standoff / OverpressureLive

cube-root scaling

At 30 m from 10 kg

7.8 kPa

Window breakage

Controls

Presets

Charge (kg TNT eq.)

Distance (m)

83 kPa — Severe structural / lethal

35 kPa — Serious injury, wall collapse

14 kPa — Eardrum rupture risk

3.5 kPa — Window breakage

Peak incident overpressure follows Hopkinson-Cranz cube-root scaling: the scaled distance Z = R/W^(1/3) sets the blast pressure. Rings show injury and damage thresholds. Screening estimate for standoff planning only — consult EOD and published safe-distance tables on scene.

▶ Run in Python

Data Inspector

Overpressure7.8 kPa

In psi1.13

Window-safe standoff65 m

Governing equation

Z = \frac{R}{W ^{1/3}} = \frac{30}{1 0 ^{1/3}} = 13.92 m/k g^{1/3} \Rightarrow P_{so} \approx 7.8 kPa

Reading this result: At 30 m from 10 kg the scaled distance is Z ≈ 13.9 m/kg^1/3, giving about 8 kPa (window breakage) — since Z = R/W^(1/3), the same pressure ring scales with the cube root of charge, so 8× the explosive only doubles every safe radius.

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Frequently asked questions

Is this good for students?: Yes — this version of "Blast Standoff for a wildfire" is framed for students learning it for a class or exam. See the concept move instead of memorizing formulas — and check your homework intuition.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.