#947 What is a rebreather?
What is a rebreather? It is an underwater device that allows divers to reuse the air that they have breathed out, thereby being able to stay underwater much longer. Most…
What is a rebreather? It is an underwater device that allows divers to reuse the air that they have breathed out, thereby being able to stay underwater much longer. Most…
What is VO2 max? The V stands for volume, the O2 for oxygen, and the max for maximum. So, it is the maximum volume of oxygen your body is able…
Why did prehistoric insects grow so big? Because there was a lot more oxygen in the atmosphere and there were no birds. The largest insect in the world today is…
Why does iron rust? The iron atoms react with oxygen molecules to produce iron oxide, which is rust. Other metals don’t rust because only iron, or metals with an iron…
What causes a stroke? There are different types of strokes, but the most common is an ischemic stroke and it is caused by a blockage in one of the blood…
When did oxygen appear on Earth? Oxygen appeared on Earth between 2.4 and 2.2 billion years ago. The air we breathe is not made up mostly of oxygen. It is…
How do fish breathe underwater? Fish use their gills to take oxygen out of the water. Why do we need oxygen? Most living beings need oxygen to create energy. All…
How do amphibians breathe underwater? They breathe through their skin. The word “amphibian” comes from the Greek amphi, meaning both and bios, meaning life. The word was first used in…
I learned this today. The surface tension of water is higher than almost all other liquids because it contains so much hydrogen. Surface tension is what allows droplets to form…
I learned this today. Whales can hold their breath for so long because they can store oxygen in their blood and muscles. On average, whales can hold their breath for…