Albedo

Schoolyard basketball court, Gorham, NH
Schoolyard basketball court, Gorham, NH

Albedo is a term I learned from astronomy. It refers to the percentage of light reflected off a surface. A theoretical perfect mirror would have an albedo of 1, as it would reflect 100 percent of the light that hits it. (There’s no perfect mirror; you always get a dimmer image in the reflection.) Conversely, I  would have figured this blacktop would have an albedo close to zero.

Apparently not: It turns out the albedo for “worn asphalt” is 0.12, or 12 percent. That’s much higher than I would have expected. Once I learned that, I began noticing that headlights reflect off of roads quite brightly, even during the day.

I guess the light is winning.

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