Becoming a SCUBA diver is more than learning how to breathe under water; you also have to understand the physics that explain why certain things occur while you are diving.
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Starting with the basics:
Density: water is 1000 times denser than air, and while air’s density can vary- the density of water cannot.
Heat: Water has a high heat capacity ~4 times more than air. Water also has high thermal conductivity. Heat is conducted 22-24 times faster in water. This means, divers get colder quicker when in water. Wet and dry suits are different types of clothing worn by divers that can keep them warmer for longer.
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Although these laws may be a lot to take in, they are all very important to all SCUBA divers. The laws help divers remain safe when adventuring in the world underwater.