Tuesday, September 11, 2012
Brrrrr.
Yesterday's wind brought in some serious cold, 38 degrees this morning. Most of the roofs are frosty. I had to turn on the heater for the first time.
Clover doesn't have heaters, so it huddles:
Why are roofs frosty when the temp is above freezing and the last 4 months were uniformly warmer than today? Shouldn't a roof be the warmest thing in the area instead of the coldest thing?
And why does clover place its leaves vertically for protection?
Maybe the same reason? Horizontal flat surfaces radiate their heat content upward, with an 'overshoot' that makes them temporarily colder than the air? Sounds plausible anyway.
Clover doesn't have heaters, so it huddles:
Why are roofs frosty when the temp is above freezing and the last 4 months were uniformly warmer than today? Shouldn't a roof be the warmest thing in the area instead of the coldest thing?
And why does clover place its leaves vertically for protection?
Maybe the same reason? Horizontal flat surfaces radiate their heat content upward, with an 'overshoot' that makes them temporarily colder than the air? Sounds plausible anyway.
Labels: Heimatkunde, Smarty-plants
¶ 6:42 AM
