thermal energy

925

Sandstone cliff
As winter approaches here in Johnson Canyon, I will be paying close attention to katabatic winds. Without looking it up, what are katabatic winds, and why would they be important to us in the canyon?

928

Snow on trees
We have already had our first snow of the year. The day it snowed, the low was only 36°F. If the temperature is above freezing, why did the precipitation not fall as rain?

941

Cat in snow
Although we have had several days with lots of sun and temperatures up in the 60's, there is still a lot of snow on the ground. Why hasn't it melted away?

961

lighter
When I was growing up, lighters made a spark by rubbing a metal wheel across a flint (which was not really made out of flint.) Lighters like this one ignite the flame in a different way. How is the gas ignited?

A Cool Change

This time, we are going to look into the sciences of chemistry and energy. It may seem strange to be looking into two different areas of science, but it is not unusual for the areas of science to overlap.

Why Fry?

This experiment is once again food related. I was preparing our evening meal as I was thinking about possibilities for experiments. As I cooked the turnips, turnip greens, yellow squash, and steamed potatoes, I considered several ideas. Then as I began to cook the hoe cakes, I knew what we would do. Hoe cakes are similar to cornbread. You add hot water to self-rising cornmeal to make a thick batter, which is spooned into a skillet of hot oil and cooked to a golden brown. Topped with some butter, they are delicious. This started me thinking about why we fry food in oil.

The Solution to Crystals

Greetings from Hot Springs, Arkansas. Nancy and I have had a wonderful week of digging quartz crystals. The truck is now much heavier, and we are tired but delighted. It was very hard to decide what to do for this week's experiment. I thought about another experiment with retinal fatigue, since all the digging in red clay left us seeing everything with a green hue. I also thought about revisiting the fact that you cannot identify a diamond by cutting glass. The quartz crystals we are digging scratch glass very easily.

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