Density and Fluids

The concept of density can explain the motion of fluids, expansion of water upon freezing, and floatation. Density is defined as mass/volume according to Density from Wikipedia the free encyclopedia, Mass is defined by the atoms a substance is composed of. Volume refers to the amount of space a material takes up. If the mass of the material increases, then its density increases. If the volume of the material increases, then its density decreases.

Fluids are liquids and gases. Fluids move according to their density. The less dense substance moves up relative to the more dense substance.

Hot air rises and cold air falls. This occurs because hot air is less dense than cold air. Warm water rises and cold water falls. Warm water is less dense than cold water, so warm water rises above cold water. This motion of fluids is called convection.

Oil floats on water, because oil is less dense than water. So the oil moves above water. When you see a fire burning on top of water with oil, it is the oil on the water that is burning.

Ice upon expansion increases its volume while its mass stays the same. This results in a density decrease. . This is why ice floats on liquid water. Remember, the less dense substance moves to the top. It is very unusual for a solid form of a material to float on the liquid form of the same material. The solid form of a substance tends to sink instead of float on the liquid form of the same substance. It is beneficial for life that water expands upon freezing and floats. If ice sunk to the bottom, then lakes would freeze from the bottom up killing all life in the body of water.

An idea behind cryonics involves freezing dead bodies with the hope of bringing the bodies back to life in the future according to Cryonics from Wikipedia the free encyclopedia. Cryonics ignores the fact that water freezes upon expansion. The human body is composed of 100 trillion cells which are mostly made of water according to Cell (Biology) from Wikipedia the free encyclopedia. When the water in these cells expands upon freezing, the cells would burst. So, in order to bring someone back from the dead it would be necessary to repair 100 trillion cells. This would be a formidable task.

A person would have an easier time staying above the water when there is salt in the water, such as an ocean. Ocean water is denser than fresh water which ultimately results in more lift on your body.

Muscle is more dense than fat. A person who is more muscular will have a greater tendency to sink than a person who is composed of a significant amount of adipose tissue.

Density can explain the motion of fluids, expansion of water upon freezing, and floatation. Understanding density will allow you to better understand the world we live in.

.Density from Wikipedia the free encyclopedia, Wikipedia
Cryonics from Wikipedia the free encyclopedia, Wikipedia
Cell (Biology) from Wikipedia the free encyclopedia, Wikipedia