A diver experiences greater pressure at greater depth. Pressure in a fluid increases with depth because of the weight of the fluid column above. The pressure at depth h is given by P = P₀ + ρgh, where P₀ is atmospheric pressure, ρ is fluid density, and g is acceleration due to gravity.
Pressure increases with depth: P = P₀ + ρgh.
A diver experiences greater pressure at greater depth.
Pressure increases by ~1 atm per 10 m depth in seawater.
At 10 m: ~2 atm; at 30 m: ~4 atm; at 100 m: ~11 atm.
Pressure acts equally in all directions at any depth (Pascal's law).
Pressure at depth h: P = P₀ + ρgh
Where: • P = absolute pressure at depth h • P₀ = atmospheric pressure = 101,325 Pa ≈ 1 atm • ρ = density of water (fresh: 1000 kg/m³; sea: 1025 kg/m³) • g = 9.8 m/s² (acceleration due to gravity) • h = depth below surface (in metres)
Example — seawater (ρ = 1025 kg/m³): At h = 10 m: P = 101325 + 1025 × 9.8 × 10 = 101325 + 100450 ≈ 201775 Pa ≈ 2 atm
At h = 30 m: P ≈ 4 atm
Rule of thumb: pressure increases by ~1 atm for every 10 m depth in seawater.
Conclusion: A diver experiences greater pressure when at greater depth.
The pressure at any point in a fluid equals the weight of the fluid column above that point per unit area.
Pressure due to fluid column = ρgh • Greater depth (h) → more fluid above → more weight → more pressure.
Direction: Fluid pressure acts in all directions at any point (Pascal's law).
Effect on the human body: • At 10 m: pressure doubles (2 atm). Lungs compress to half size. • At 30 m: pressure = 4 atm. Significant physiological effects. • Beyond 60 m: nitrogen narcosis risk. • Deep dives require special gas mixtures (helium-oxygen).
SCUBA diving limit: • Recreational: up to 40 m • Technical diving: can exceed 60 m with proper training and equipment
Decompression sickness ("the bends"): Caused by ascending too quickly — dissolved nitrogen forms bubbles in blood.
Scenario → Pressure At sea surface → 1 atm (101,325 Pa) At 10 m depth (sea) → ~2 atm At 20 m depth (sea) → ~3 atm At 100 m depth (sea) → ~11 atm At Mariana Trench (~11 km) → ~1100 atm
Fresh water vs seawater: • Fresh water: ρ = 1000 kg/m³ • Seawater: ρ = 1025 kg/m³ • A diver experiences slightly more pressure in seawater at the same depth.
Key point: A diver swimming horizontally at the same depth experiences the same pressure throughout. Going deeper always increases pressure.
A diver experiences greater pressure at greater depth. Pressure P = P₀ + ρgh increases with depth h. Every 10 m of depth in seawater adds approximately 1 atm of pressure.
P = P₀ + ρgh, where P₀ = atmospheric pressure, ρ = fluid density, g = 9.8 m/s², h = depth.
P = 101325 + 1025 × 9.8 × 10 ≈ 201,775 Pa ≈ 2 atm. Pressure doubles compared to the surface.
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