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Martian Atmosphere

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining the characteristics of the Martian atmosphere.

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Hi, Dr. D. 00:00:00
Hi, guys. 00:00:01
Is that the terrarium that you mentioned on the phone? 00:00:02
Yes, it is. 00:00:05
A terrarium is a clear container filled with small plants. 00:00:06
The plant is open to the atmosphere, but mine is going to be tightly closed. 00:00:09
It's really tricky to maintain all the basic needs of plants after I close it up. 00:00:12
We learned about the needs of humans and animals. 00:00:17
They include water, shelter, food, and air. 00:00:19
What are the basic needs of plants? 00:00:23
I'm sure they need water. 00:00:24
And they need food. 00:00:26
That's right. The most basic food of plants is the carbon dioxide in the air. 00:00:27
And plants also need sunlight. 00:00:31
You bet. If my terrarium is going to be successful, it must meet all these needs. 00:00:33
Hey, I understand you need some help in finding a model for a habitat for Mars. 00:00:37
We're having a little trouble getting started. 00:00:41
Well, the best place to get started is to understand your problem by gathering information. 00:00:43
Do you mean like the scientific method? 00:00:47
That's right. So what do you know about the atmosphere of Mars? 00:00:49
We know that it's mostly made up of carbon dioxide and hardly any oxygen. 00:00:52
That's right. And not only that, but the Martian atmosphere is much less dense than the Earth's atmosphere. 00:00:56
So in addition to not having any oxygen to breathe, there's yet another difficulty. 00:01:00
What do you mean? 00:01:04
Let me show you with this vacuum pump. 00:01:06
Here, touch this water. 00:01:10
What does it feel like? 00:01:12
It's warm, but it's not very hot. 00:01:14
I'm going to put this water underneath the bell jar. 00:01:17
And the vacuum pump is going to pull most of the air out of the bell jar. 00:01:20
Let's see what happens. 00:01:23
Wow, the water's starting to boil. 00:01:26
Does that mean it's hot? 00:01:28
Let's find out. 00:01:30
It's even cooler than before. 00:01:38
That's right. The water didn't boil because it was hotter. 00:01:40
It turns out when the atmosphere is less dense, water will just boil at a much lower temperature. 00:01:43
On Mars, you can have ice or water vapor. 00:01:47
But any liquid water will simply boil away or freeze. 00:01:50
I guess our habitat had better have a denser atmosphere than Mars. 00:01:54
Thanks, Dr. D. 00:01:57
Oh, and by the way, I'm concerned about why the fish are missing from my favorite fishing spot. 00:01:59
Maybe you should have the water tested. 00:02:04
I also want to contact Ranger Cortez at Sandy Bottom Park. 00:02:06
He may be able to help you. 00:02:09
Thanks, Dr. D. Bye! 00:02:11
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Idioma/s:
en
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:
297
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 13″
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:
13.46 MBytes

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