Moving Heat Energy

Moving Heat Energy
Winter always reminds us of how important it is to have ways of moving heat energy from one place to another. We are considering how the complex heat transfer system is another evidence for God’s creative wisdom. Yesterday we looked at heat transfer by radiation. There are two more methods.

A second way of moving heat energy is by conduction. When you put a spoon into a hot cup of water the molecules that make up the spoon begin to vibrate faster as they absorb heat energy from the water. As one molecule gets energy, it bumps into the next molecule, and it also starts to vibrate. This happens down the length of the spoon, and eventually, the heat is conducted to your skin.

How fast heat conduction happens depends upon the size, mass, and density of the material in the object conducting the heat. Gases have poor conductivity because their molecules are far apart. A winter coat has lots of spaces between the fabric molecules filled with air. Fur has air spaces between the hairs and inside the hair strands themselves. Those low-density spaces insulate against heat transfer. You have heard the old story about never putting your tongue on a very cold metal object. The reason is that the water in your tongue conducts heat away to the metal surface which is very dense. The heat transfer process happens so fast that the water in your tongue freezes.

A third method of moving heat energy is by convection. Heating air or water is difficult by radiation alone or by conduction alone. The materials are transparent, so they absorb radiation poorly. Conductivity is slow and limited as to how far the heat can travel. What happens is that molecules change their density as they are heated or cooled. When heated, the gas or liquid becomes less dense it rises taking heat energy with it. As it cools, it sinks because it becomes denser. The motion mixes the hot and cold in the process we call convection.

The amazing ability of water to change its density as it is heated and cooled allows lakes to form ice on the surface rather than on the bottom. Water was designed to have its lowest density at 32 degrees Fahrenheit. It has a higher density both above and below that temperature. A very complex chemical property of water is designed to handle the heat energy by becoming more dense down to 32 degrees and then less dense as it freezes into ice. You can read more about this essential characteristic of water in THIS PREVIOUS POST and in our book Dandy Designs Volume 3, available HERE.

We take for granted the various methods of moving heat energy in and around us, but the complexities of this design are amazing. My physics students love to see how this allows us to exist on this planet.
–John N. Clayton © 2019

Oxygen Atom Design and Water

Oxygen Atom Design and Water
In our post for yesterday (July 7, 2018) we dealt with oxygen as a designed feature promoting life by allowing us to breathe. Another interesting design feature relates to the oxygen atom design and water. The oxygen molecule’s design allows water to have the properties that it has.

The oxygen atom has eight electrons in orbitals based on their energy with the electrons paired so that their magnetic polarities are balanced. Each electron is essentially a little magnet with a north and a south pole. When the electrons are together in a pair, one electron’s north pole matches up with the second electron’s south pole. In oxygen, the first two electrons are in what is called the S orbital. The next energy level out is also an S orbital with two electrons. The third energy level out from the nucleus is the P orbital. This orbital can hold six electrons, but oxygen has only four electrons left. Two of the electrons are paired, but the remaining two are unpaired. They orbit in a pattern at right angles to one another. These orbits are not spherical but in the shape of a dumbbell.

What is the importance of oxygen atom design and water? A water molecule consists of two hydrogen atoms attached to the oxygen atom in such a way that they pair up with the two unpaired electrons. That means the water molecule is polar in nature with the hydrogen atoms on one end of the molecule and the oxygen atom on the other. The bond angle of the hydrogen atoms would be 90 degrees except for the fact that they repel each other. The repulsion forces the angle out to 105 degrees. This design allows water to have its unique properties which allow life to exist on Earth.

When water freezes, the molecules spread out due to the polar nature of the water molecule. Because of that, ice is lighter than liquid water so lakes freeze on top instead of on the bottom. If lakes froze from the bottom up, life in the water would not be possible. Also because of the polar nature of the water molecule, water dissolves things like salt.

The unique properties of water are due to the design of the oxygen molecule. As a high school chemistry teacher I always enjoy teaching about the oxygen atom design and water. Students are enthralled at the design built into such a simple thing as an oxygen molecule. Almost every time I teach this unit I have some kid say something like, “Wow! Who thought this up?” But this is not the product of a human engineer. An Engineer far wiser than any human created the design of oxygen and built a world that can support life.
–John N. Clayton © 2018
The illustrations are from John N. Clayton’s book The Source: Eternal Design or Infinite Accident? The book goes into much more detail and is available HERE.

Design of Snow Is Awesome

Design of Snow Is Awesome
As I write this, we are sitting here in Michigan after having experienced a record snowfall for one day. As we shovel and snow-blow our driveways and around our mailboxes, we hear a great deal of abusive language from our neighbors. Still, there is a great deal of good in every snowflake because of the design of snow.

It is not just the aesthetic value of snowflakes that makes them good, although that certainly is a wonderful thing to see under a hand lens or microscope. The snow has a variety of other positive attributes designed into its structure.

A snowflake is made of water which is a polar molecule meaning that it has a positive and a negative end. The reason ice forms and water expands as it freezes is that the positive end of one molecule is attracted to the negative end of the next molecule. This structure also allows the snowflake to attract particles in the atmosphere that have a polar makeup. Salt, for example, has a sodium atom which has a plus charge, attracted to chlorine which has a negative charge. A salt molecule in the atmosphere will be attracted to a snowflake. Even molecules such as carbon compounds, which do not generally have a polarity, are attracted to the snowflakes. Snow cleans the air, and many of us enjoy being outside when it is snowing because of the freshness and purity it gives the air.

Snow stores water in places where water shortages are a problem. The western United States gets heavy snow in the mountains in winter. Water has a high heat of fusion. What that means is that it takes extra energy to melt ice–80 calories per gram of ice to be exact. For that reason, snow stays in the solid state for a long time after the temperature has risen above freezing. That allows snow to melt slowly sending a constant supply of water to dry areas at lower elevations.

The design of snow is also friendly to animals, especially small animals. When the snow is finally off the ground here in Michigan, there will be small tunnels visible in the ground where mice, voles, squirrels, and other small animals have built passageways under the snow. The low temperatures of the air in winter are not a problem for these animals because the snow is a good insulator. Predators cannot easily get to the animals because the snow covers them from aerial attacks.

Water is unique in many ways. Its freezing temperature and its boiling temperature are only 100 Celsius degrees apart. That allows water to exist on our planet as a solid, a liquid, and a gas. Each of those states of water allows some form of life to exist.

In Job 38:22 God questions Job, “Have you entered into the treasures of the snow? Or have you seen the treasures of ice which I have reserved against the time of trouble…” The Hebrew word translated “treasure” in this verse is atsar meaning “a thing laid up.” It is doubtful that Job knew anything about the water cycle or how he benefited from snow. But the God who designed snow and its role on Earth to benefit humans and all living things certainly knew all about the design of snow.
–John N. Clayton © 2018
Michigan also has “summer snow”