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NASA Why? Files segment describing different cloud types and how they form.
We're supposed to meet Dr. Lynn Chambers.
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There she is.
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Hello, Dr. Chambers.
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Treehouse detectives?
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I've been expecting you.
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Thanks for seeing us.
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Well, we wanted to learn more about clouds
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and what they mean.
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Do you know how a cloud is formed?
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Not really.
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I always thought it's when the sun sucks up a lot of water.
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Then the clouds are formed.
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Good guess.
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But maybe I can explain it to you a little better
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if I make a cloud for you.
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You can make a cloud?
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Do we get to go up in an airplane?
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No.
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We can do it right here.
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First, we'll fill this jar with water.
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We need about two centimeters of water.
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Did you know that 2.5 centimeters
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is equal to one inch?
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Then we place some ice cubes in this metal tray
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and place it on top of the jar.
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The air inside the jar will cool
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and the water vapor in the air will condense.
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What does condensed mean?
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Have you ever been outside on a really cold day?
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What happens when you breathe?
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My breath looks like smoke.
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That's condensation.
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Your breath contains water vapor just like the air does.
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Oh, that reminds me.
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We forgot to add particles.
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Do you see a cloud yet?
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I see water drops forming.
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The water condensation on the jar is not a cloud.
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We need to add something for the water to condense on.
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Any ideas?
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Um, how about some dust from my room?
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Or how about chalk dust?
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That might work.
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We could use a number of things.
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In the real world, it would be sea salt, dust,
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volcanic aerosols, or man-made pollution.
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Since we don't have any of those here,
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I'm going to use a match.
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This is the part where you need an adult.
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So what will happen?
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Let's give it a try.
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I can see a cloud forming.
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How do we know that's just not the smoke from the match?
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We can shut off the condensation and make the cloud
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disappear by simply taking the ice away.
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Do you want to try it?
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Sure.
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It vanished.
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The cloud we made looked very wispy.
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But in the sky, we see all different kinds of clouds.
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Are there different types?
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Yes, there are three main cloud types,
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cirrus, cumulus, and stratus.
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Cirrus clouds are high clouds that form above 6,000 meters.
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What are those round puffy clouds
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that look like cotton candy?
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Those are cumulus clouds.
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They're found at different heights.
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They're often seen on dry, sunny days.
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What do you call those little clouds that cover the sky?
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Those are stratus clouds.
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Their base is usually found at low levels below 500 meters.
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And they form a layer or sheet across the sky.
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Do different types of clouds indicate
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different types of weather?
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Some clouds do indicate different types of weather.
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One of our treehouse detectives' class
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belongs to your cloud club?
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Yeah, it's called school for students'
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cloud observations online.
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We have 1,000 schools around the world
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where students are observing clouds.
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They send their data to a NASA computer
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and their observations are compared to those
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from CIRRUS instruments flown on satellites.
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So kids actually help NASA?
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Yes, we use the students' data to help us identify clouds
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with which the satellite has trouble seeing.
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That is way too cool.
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Just think, kids are actually helping NASA.
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Thanks, Dr. Chambers.
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- Valoración:
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- Idioma/s:
- Niveles educativos:
- ▼ Mostrar / ocultar niveles
- Nivel Intermedio
- Autor/es:
- NASA LaRC Office of Education
- Subido por:
- EducaMadrid
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 235
- Fecha:
- 28 de mayo de 2007 - 15:33
- Visibilidad:
- Público
- Enlace Relacionado:
- NASAs center for distance learning
- Duración:
- 03′ 16″
- Relación de aspecto:
- 4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
- Resolución:
- 480x360 píxeles
- Tamaño:
- 19.70 MBytes
