1. A basic snorkeling method involves breathing through a tube which has its oth
ID: 1793414 • Letter: 1
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1. A basic snorkeling method involves breathing through a tube which has its other end open to air. How deep can you dive before you have difficulty breathing? (Assume 'difficulty breathing is equivalent to two people of 70 Blaise Pascal kg standing on your chest (of area 30 cm x 30 cm), if you are lying down.) (61 How do Scuba divers manage to dive deeper than this? 12) Divers use the saying "The pressure increases by 1 atm for every 10 m of depth into the sea". Show that this is a good approximation. 2. 3. The deepest surveyed point of the oceans is the 'Challenger point', named after the British survey ship HMS Challenger whose crew discovered it in 1875. It lies in the Mariana trench near the Philippines and Japan. The depth here is 10,900 m below sea level. What is the pressure at this depth, relative to atmospheric pressure (1 atm- 101 kPa)? 15)Explanation / Answer
1. for difficulty in breathing
Extra pressure on chest = 70*2*9.81/0.3^2 Pa = 15260 Pa
let the depth be d
then
1000*d*9.81 = 15260
d = 1.5556 m
hence below 1.5556 m, snorkelling gets difficult
Scuba divers manage to dive depeer than this by ussign pressurised oxygen cylinders that supply oxygen at different partial pressure to make up for this extra pressure
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