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Why Do Black Shirts Get Hot in the Sun?

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Reader Chuck from California asked, “I’ve heard my whole life that the color black absorbs heat and white reflects heat. What's the science behind that?”

No doubt most of us have heard that objects that are black or other dark colors are more absorbent and white and light objects are more reflective, but let’s start out by clarifying just what’s being absorbed and reflected. It’s not heat, but another form of energy: light. Heat comes into play a little bit later.

The observable color of an object has to do with the light wavelengths that are reflected from that object. This reflection, in turn, depends the atomic and molecular properties of the object, its surface structure and the angles at which the light hits it and at which someone observes it, among other things. An apple is red because when white light, which is made up of all visible wavelengths mixed together, hits it, its atomic innards reflect all the red wavelengths more than the other colors and bounce them at our eyes.

A black object, like a t-shirt, looks black because it absorbs all the wavelengths in white light and reflects none. As the shirt absorbs all the light coming from sun and, say, a desk lamp, the energy carried by that light doesn't just disappear into the shirt, never to be seen again. Instead, as the light is absorbed, it gets converted to other forms of energy, usually heat, and then emitted by the shirt. The darker the object, the better it emits heat, because it’s a better absorber of light.

On the other hand, a white object appears white because it reflects all the different wavelengths and absorbs little to no light. It doesn’t absorb much energy, then, and puts off little to no heat.

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Words
Why Is 'Colonel' Spelled That Way?
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English spelling is bizarre. We know that. From the moment we learn about silent “e” in school, our innocent expectations that sound and spelling should neatly match up begin to fade away, and soon we accept that “eight” rhymes with “ate,” “of” rhymes with “love,” and “to” sounds like “too” sounds like “two.” If we do sometimes briefly pause to wonder at these eccentricities, we quickly resign ourselves to the fact that there must be reasons—stuff about history and etymology and sound changing over time. Whatever. English. LOL. Right? It is what it is.

But sometimes English takes it a step too far, does something so brazen and shameless we can’t just let it slide. That’s when we have to throw our shoulders back, put our hands on our hips and ask, point blank, what is the deal with the word “colonel”?

“Colonel” is pronounced just like “kernel.” How did this happen? From borrowing the same word from two different places. In the 1500s, English borrowed a bunch of military vocabulary from French, words like cavalerie, infanterie, citadelle, canon, and also, coronel. The French had borrowed them from the Italians, then the reigning experts in the art of war, but in doing so, had changed colonello to coronel.

Why did they do that? A common process called dissimilation—when two instances of the same sound occur close to each other in a word, people tend to change one of the instances to something else. Here, the first “l” was changed to “r.” The opposite process happened with the Latin word peregrinus (pilgrim), when the first “r” was changed to an “l” (now it’s peregrino in Spanish and Pellegrino in Italian. English inherited the “l” version in pilgrim.)

After the dissimilated French coronel made its way into English, late 16th century scholars started producing English translations of Italian military treatises. Under the influence of the originals, people started spelling it “colonel.” By the middle of the 17th century, the spelling had standardized to the “l” version, but the “r” pronunciation was still popular (it later lost a syllable, turning kor-o-nel to ker-nel). Both pronunciations were in play for a while, and adding to the confusion was the mistaken idea that “coronel” was etymologically related to “crown”—a colonel was sometimes translated as “crowner” in English. In fact, the root is colonna, Italian for column.

Meanwhile, French switched back to “colonel,” in both spelling and pronunciation. English throws its shoulders back, puts its hands on its hips and asks, how boring is that?

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Big Questions
Why Do Cats Love Scratching Furniture?
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Allergy suffering aside, cat ownership has proven health benefits. A feline friend can aid in the grieving process, reduce anxiety, and offer companionship.

The con in the cat column? They have no reservations about turning your furniture into shredded pleather. No matter how expensive your living room set, these furry troublemakers will treat it with the respect accorded to a college futon. Do cats do this out of some kind of spite? Are they conspiring with Raymour & Flanigan to get you to keep updating home decor?

Neither. According to cat behaviorists, cats gravitate toward scratching furniture mostly because that love seat is in a really conspicuous area [PDF]. As a result, cats want to send a message to any other animal that may happen by: namely, that this plush seating belongs to the cat who marked it. Scratching provides both visual evidence (claw marks) as well as a scent marker. Cat paws have scent glands that can leave smells that are detectable to other cats and animals.

But it’s not just territorial: Cats also scratch to remove sloughed-off nail tips, allowing fresh nail growth to occur. And they can work out their knotted back muscles—cramped from sleeping 16 hours a day, no doubt—by kneading the soft foam of a sectional.

If you want to dissuade your cat from such behavior, purchasing a scratching post is a good start. Make sure it’s non-carpeted—their nails can get caught on the fibers—and tall enough to allow for a good stretch. Most importantly, put it near furniture so cats can mark their hangout in high-traffic areas. A good post might be a little more expensive, but will likely result in fewer trips to Ethan Allen.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

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