People float in water because the human body weighs less than the volume of water it displaces when submerged. The buoyancy of an individual depends on his or her body type, as those with more muscle tend to sink further, while those with more body fat float more efficiently.Continue Reading
When an object is placed into water, it is entering a cylinder of water from the surface to the bottom. It displaces some of the water in that cylinder, and the water beneath it exerts upward pressure. If the volume of water that is displaced is lighter than the object, the pressure will be insufficient to keep it afloat. If the equivalent volume of water is heavier than the object, the remaining water in the cylinder will keep it at or near the surface.
Human bodies tend to float due to stores of fat and to the volume of air stored in the lungs. However, those with very low body fat percentages may have a more difficult time managing to stay afloat. Lying horizontally can improve floating capacity, as it increases the surface area exposed to the upward pressure from the water. On the other hand, clothing can absorb water and increase in weight, possibly making the difference between floating and sinking.Learn more about Human Anatomy
On average, it takes the human body approximately two to three hours to excrete a liter of water through the bladder. This is dependent on several factors, including the absorption of water, the components in the water, if dehydration is present, the time of day and the general health of the person.Full Answer >
Body composition is a special term used in physical fitness that measures the percentage of fat, muscle, water and bone found in the human body. Measuring body composition is a specialized way to determine one's true physical fitness.Full Answer >
According to WebMD, the hardest tissue in the human body is tooth enamel. Tooth enamel is the thin, hard, white covering that protects the dentin of the teeth.Full Answer >
Some weird facts about the human body are that humans shed about 1.5 pounds of skin per year and adults have 144 fewer bones than infants. Some other facts are that the human nose can remember about 50,000 different smells and the small intestines are up to 23 feet long.Full Answer >