| 제목 | 물방울에 의한 화재가 가능할까요? | ||
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| 작성자 | 이승훈 | 등록일시 | 2010-01-18 |
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 Can a Water Droplet Cause a Fire? LiveScience Many gardeners swear you should not water in the midday because water droplets on plants can magnify the suns rays and burn leaves. But the idea has never been rigorously tested until now. printemailshare recommend (0) Louise Docker/Wikipedia Depending on the surface of a leaf scientists have found a magnifying-glass effect that can lead to sunburns ... and possibly forest fires. Many gardeners swear you should not water in the midday because water droplets on plants can magnify the suns rays and burn leaves. But the idea has never been rigorously tested until now. "This is far a trivial question said biophysicist Gabor Horvath at Eotvos University in Budapest, Hungary. The prevailing opinion is that forest fires can be sparked by intense sunlight focused by water drops on dried-out vegetation." Horvath and colleagues used both experiments and computer modeling to figure out the physics that goes on. The results varied depending on the type of leaf. On smooth surfaces such as a healthy maple leaf no leaf burn occurred. But on leaves with small wax hairs such as those of the floating fern the hairs were able to hold water droplets above the leaf surface creating a magnifying-glass effect that gave the leaves a noticeable sunburn — though no open flames resulted. Could the same effect on a dry leaf start a forest fire? "If the focal region of drops falls exactly on the dry plant surface intensely focused sunlight could theoretically start a fire Horvath said. However the likelihood is reduced as the water drops should evaporate before this so these claims should be treated with a grain of salt." However hairy human skin might suffer the same effect enhancing sunburn the researchers speculate. "In sunshine water drops residing on smooth hairless plant leaves are unlikely to damage the leaf tissue Horvath and colleagues conclude. However water drops held by plant hairs can indeed cause sunburn and the same phenomenon can occur when water droplets are held above human skin by body hair." The findings are detailed in the journal New Phytologist. Copyright © 2010 LiveScience.com. All Rights Reserved. This material may not be published broadcast rewritten or redistributed. |
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