Swedishoo
Admin
Posts: 690
(3/27/2004 8:14:13 PM)
| Kids and Contrails
| garflorida from Chemtrail and Company III |
|
| Kids and Contrails |
 Posted 8-31-2001 16:41 |
I don't know, but this seems like conditioning..... click here | |
| swedishoo from Chemtrail and Company III |
|
| Amazing...Teach Em So they Can Tell The Parents, "They're Just CONTRAILS, Mom" |
Posted 9-1-2001 03:38 |
Looks like heavy conditioning to mee too! AND THEY PREDICT THE WEATHER TOO! Couldn't resist printing it here.
Contrails
E: Hi there ... this is Ed. Have you ever seen long white streaks in the sky and wondered what they were? Well, I'll give you a hint -- they're made out of water and they're made by something that flies through the air. If you're still wondering, keep listening and we'll tell you -- up next on Kid's Earth and Sky.
Scott McBryde
Georgetown, TX
Age: 8.5
Used: Crayons
E: This is Kids' Earth and Sky, with a listener's question.
K: Danielle in Denton, Texas writes, "How do jet planes make the white streaks we see in the sky?"
E: Hey, Danielle, you know how on a cold day you can see your breath? Pretty much the same thing happens to make those white streaks in the sky -- which are called contrails -- short for condensation trails. An airplane makes a contrail by pumping warm moist air from its exhaust into colder air.
K: As the plane flies through the atmosphere, some of the new moisture it releases condenses into water droplets -- and some of it freezes into ice crystals. And that's what you see as a contrail. Contrails don't last very long because their source doesn't stay put. When the plane files off, the contrail isn't replaced. Upper level winds quickly blow it away.
E: And you know, you can use contrails to predict the weather. If a jet's contrail looks kind of wimpy -- and disappears quickly -- then the jet is probably flying through relatively dry air -- a sign that fair weather is coming. On the other hand, a thick, long-lasting contrail indicates humid air high in the atmosphere. So a storm may be on the way.
K: That's our show for today. Danielle, thanks for your question. If you have a science question, send it to kids@earthsky.com. The National Science Foundation helps make our show possible. We talk about everything on the Earth ...
E: ... and in the sky ...
K: ... on Kids' Earth and Sky. | |
|
