1. Quelle est la composition principale de l’air en termes de gaz ?
2. Quelle est la composition principale de l’air en pourcentage ?
3. Quelle est la pression atmosphérique standard au niveau de la mer ?
Air — composition ?
80% N2, 20% O2, autres gaz
L’air — composition majoritaire?
80% diazote (N₂), 20% dioxygène (O₂)
Pression atmosphérique — valeur ?
1 bar (1000 hPa)
Pression atmosphérique — valeur?
1 bar (1000 hPa)
Pression sous l’eau — augmentation ?
+0,1 bar par mètre
Pression sous-marine — augmentation?
+0,1 bar par mètre depth
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