A diver at 66 feet (20 m) breathes from a tank with 3000 psi. Using Boyle's Law, approximately how much air (in surface-equivalent volume) has been consumed if the tank now reads 1500 psi?
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A
Half the tank's surface-equivalent volume
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B
One quarter of the tank's surface-equivalent volume
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C
Three quarters of the tank's surface-equivalent volume
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D
The same volume as at the surface