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Scientific Method-Hypothesis and Observation

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining how hypotheses and observation come into play in removing odors at a wastewater treatment facility.

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Okay, we're here, but now where do we go? 00:00:00
Wow, how big this place is. 00:00:03
It's pretty neat. 00:00:06
Look, there's someone straight ahead. 00:00:07
She must be the smell expert. 00:00:09
We're meeting a scientist named Paula Hogg. 00:00:10
Hi guys, I've been expecting you. 00:00:14
Dr. D said you would be on your way. 00:00:15
Hi, I'm Bianca, this is Matthew and Jacob. 00:00:18
I'm Paula, how can I help you? 00:00:22
We want to get our faces on KSNN. 00:00:24
What he means is he wants to help KSNN 00:00:27
find the source of the smell. 00:00:30
Oh, well I can show you where the source 00:00:32
of the odor starts here. 00:00:34
First you're gonna need some of these. 00:00:36
Do you use a scientific method here? 00:00:38
Yes, we do. 00:00:40
First step is to find and observe the problem. 00:00:41
This is where the wastewater comes 00:00:45
into the plant from our homes. 00:00:46
The wastewater contains odorous substances 00:00:48
like hydrogen sulfide and ammonia. 00:00:50
Hydrogen sulfide is sometimes called the rotten egg gas. 00:00:53
Some of these substances are formed in the sewer 00:00:58
when bacteria break down organic material 00:01:00
in the wastewater. 00:01:03
Man, this is definitely where the smell is coming from. 00:01:06
Yes, and you're using your sense of smell 00:01:11
to observe the problem. 00:01:13
Next step is to collect data. 00:01:15
Hey, neat, what is that? 00:01:18
It's a hydrogen sulfide meter. 00:01:20
What does it show us? 00:01:22
With this we can measure exactly how much 00:01:23
hydrogen sulfide gas is in the air. 00:01:25
And next we need to come up with a hypothesis. 00:01:28
Do you know what a hypothesis is? 00:01:30
I do, it's a guess. 00:01:32
Well, it's an educated guess. 00:01:34
It's when we use our facts, observations, and data 00:01:36
to come up with a possible answer to the problem. 00:01:39
Is this where you get rid of the odor? 00:01:42
Yes, it is. 00:01:44
We know that the odor is mainly caused 00:01:46
by the release of hydrogen sulfide gas, 00:01:48
which can be controlled by chemical processes 00:01:50
such as these. 00:01:53
What's that? 00:01:54
These are scrubbers. 00:01:56
Look through the window 00:01:58
and observe the odor removal process. 00:01:58
These wet scrubbers change the gas 00:02:01
and turn it into liquid, which removes the odor. 00:02:03
And we use all of our data and observation 00:02:06
to make sure the system works. 00:02:09
How do you know if your hypothesis is working? 00:02:15
We test our hypothesis every day at the treatment plant. 00:02:18
We use our noses again? 00:02:21
Yes, our sense of smell can tell us 00:02:24
if the odor is being controlled. 00:02:26
But we also use a meter. 00:02:29
Plant operators check the sulfide levels going into 00:02:31
and coming out of the scrubbing system 00:02:35
at least a dozen times a day. 00:02:37
Based on this, we can make adjustments 00:02:39
to the odor control process. 00:02:41
The smell is much better. 00:02:44
Does this remove all the odor? 00:02:46
Well, under the right conditions, 00:02:48
almost all of the odor can be taken away. 00:02:50
Wow, look at this place. 00:02:54
Something sure is happening here. 00:02:56
It looks like my bubble bath 00:02:59
that's after I've been playing all day. 00:03:01
This is the aeration basin. 00:03:04
Look closely. 00:03:06
A lot of change is happening here. 00:03:08
Bacteria are working to remove odor and other pollutants. 00:03:10
After all this, I'm sure the water must be really clean. 00:03:14
And the odor has to be removed. 00:03:19
Must be really clean. 00:03:21
And the odor has to be gone. 00:03:23
Well, that's the goal. 00:03:25
But if there's still an odor, 00:03:27
we can go back to the scientific method 00:03:28
to solve our problem. 00:03:30
The scientific method. 00:03:32
But how do you know the odor is gone for good? 00:03:35
Well, at the end of the treatment process, 00:03:38
we test to make sure that the odor 00:03:40
and other pollutants are gone. 00:03:42
This place is really cool. 00:03:44
Wow, it looks so clean. 00:03:48
Wow. 00:03:50
Well, have you learned enough about the scientific method 00:03:52
to help you with your smell problem? 00:03:55
Yes, I think we all should think about a hypothesis. 00:03:57
Yes, a hypothesis and variables. 00:04:01
Hi, Dr. D. 00:04:05
Oh, it's the investigative smells team. 00:04:07
How you doing? 00:04:09
We visited the smell experts 00:04:10
at the wastewater treatment plant. 00:04:11
Yeah, and a scientist named Paula Hogg 00:04:13
showed us how she used the scientific method on her job 00:04:16
to track stink at the plant. 00:04:19
So tell me, did you learn any more about science? 00:04:21
Yes? 00:04:23
We learned it's why scientists ask so many questions. 00:04:24
It's because they're curious. 00:04:28
Why don't you try one of these information sheets? 00:04:30
I always use them to keep me straight 00:04:32
when I'm researching problems. 00:04:33
Hmm, identifies a variety 00:04:35
of potential sources of information. 00:04:38
We're going next. 00:04:41
Identifies inaccurate and misleading information, 00:04:43
selects information appropriate to the problem 00:04:46
or question at hand. 00:04:49
This looks like it'll be helpful. 00:04:51
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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:
342
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
04′ 53″
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:
29.30 MBytes

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