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Blood Alcohol Concentration (BAC) estimates how much alcohol is in the bloodstream, calculated using the Widmark formula. BAC is influenced by units consumed, body weight, time elapsed, and biological sex (different body water percentages).
Panduan Langkah demi Langkah
- 1Widmark formula: BAC% = (Alcohol grams) / (Body weight kg × 1000 × r) − 0.015 × hours
- 2r = 0.68 (males), 0.55 (females) — distribution factor
- 31 UK unit = 10ml pure alcohol = ~8g
- 4Alcohol eliminated at ~0.015% per hour (linear, not exponential)
Contoh Terpecahkan
Masukan
4 pints (4% lager) · 70kg male · 2 hours drinking
Hasil
BAC ≈ 0.087% (over UK legal limit of 0.08%)
Drive limit 0.05% in Scotland, 0.08% in England/Wales
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