Conversely, if a balloon with a volume of 3 liters of air is brought up from a depth of 30 meters to the surface, the volume of air will expand to 12 liters, or 4 times its original size. For example, the lungs of a human have a capacity of about 6 liters at the surface level, so when diving to a depth of 10 meters, 20 meters, and 30 meters, the volume of air will be reduced to 3 liters, 2 liters, and 1.5 liters, respectively. Robert Boyle, an Irish scientist, outlined Boyle's Law in 1662, which states that changes to volume are inverse to changes in pressure, meaning that if the pressure increases, the volume decreases.
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