The Dead Sea
Question:
A family traveled to the Dead Sea.The Dead Sea is the lowest place on the earth. (-429 m under the sea level) .
Look at the short video they filmed  in the way down .You can see the sign along the way marking the point when they pass trough the sea level.( Enlarge the movie by opening in the full screen mode.)
When they arrive to the shore they put water on to boil. You can see the pot of boiling water in the picture. Read carefully the information in the adjacent box.
 The boiling point is the temperature at which  the vapor acquires enough energy to overcome the atmospheric pressure .As the water heats up, bubbles form and rise .When the vapor is grater than the atmospheric pressure , the bubbles will burst at the surface releasing water vapor to the atmosphere..
The atmospheric pressure depends on the altitude.
Examine the table regarding the altitude and the atmospheric pressure.
 

 
Answer the following question: Compare the boiling point (BP) of the water in the Dead Sea region to the BP of the water in New York City (sea level) .
 
1 People tried to answer this question

The boiling point of the water is lower in the Dead Sea regionbecause the high atmospheric pressure at that altitude.
The boiling point of the water is lower in the Dead Sea regionbecause the low atmospheric pressure at that altitude.
The boiling point of the water is higher in the Dead Sea region because the low atmospheric pressure at that altitude.
The boiling point of the water is higher in the Dead Sea region because the high atmospheric pressure at that altitude.



Comments:
1.  Ryndin Alina (2007-12-20 15:00:00)
A comment for "The Dead Sea"
Dear Rivka,
In my opinion, your topic is very interesting.
You gave the dead sea as an example of something that usually people don't think about - the pressure there.

Things to do differently:
In my opinion, the question should be bolder or bigger.
you wrote: "Answer the following question: How is the boiling point of the water at the Dead Sea region in comparison with the boiling point at the sea level ?", and writing only the question in a bigger font would be easier to find out what to do.

All the other things are great.
I really liked it!
Good luck!!!
Alina.
2.  Goldik Rivka (2009-12-20 15:00:00)
Enlarging the font
Thank you Alina  for your comment. I was able to make the font BOLD in order to make the question more outstanding from the text. Unfortunately I couldn't make it bigger .
3.  Goldik Rivka (2009-12-20 15:00:00)
Enlarging font , only with Explorer

I realized that when opening with explorer the "enlarge" feature works!

I Hope that the question is clear now.

4.  Mir Debby (2017-12-20 15:00:00)
New Comments (Debby Mir)

Hello Goldik,

Your question highlights the importance of the Dead Sea as a unique phenomenon and important tourist site, so we really should take much better care of it and also value its resources more carefully and who and which generation benefits from its gifts. In particular, for this presentation, the film provides very and interesting special information I had not heard of. I appreciate the multi-phase descriptions – discussing the benefits of the air, water and materials.

1.      I'm not sure about the short video filmed on the way down, the picture we see is intriguing but confusing, what is it? You don't say anything about it in the text. The film doesn't give a feeling about how much/low the dead sea is below sea level. If this is the film you provide, you should say something about the geology or what they are seeing or how the sea was formed.

2.      There is some confusion in the English text and content. I suggest:

When they arrive to the shore they put water on to boil. You can see the pot of boiling water in the picture. Read carefully the information in the adjacent box.

The boiling point is the temperature at which the vapor acquires enough energy to overcome the atmospheric pressure. At this point the bubbles will rise to the surface and burst

As the water heats up, bubbles form and rise when the vapor pressure is greater than the atmospheric pressure. At this point the bubbles will burst at the surface releasing water vapor to the atmosphere.

Since you discuss the bubbles, I think you should add this last sentence to your explanation.

In the table you should write "Mount Everest"

Answer the following question: How is the boiling point of the water at the Dead Sea region in comparison with the boiling point at the sea level ?

 I suggest the following alternative:

Compare the boiling point (BP) of water in the Dead Sea region to the BP of water in New York City (sea level). Describe the difference and explain.

I suggest making the following changes to the answers as this makes it more clear we are talking about atmospheric pressure at the Dead Sea

 

The boiling point of water is lower in the Dead Sea region because of the low atmospheric pressure at that altitude.

 

  The boiling point of water is lower in the Dead Sea region because of the high atmospheric pressure at that altitude.

 

  The boiling point of water is higher in the Dead Sea region because of the low atmospheric pressure at that altitude.

 

  The boiling point of water is higher in the Dead Sea region because of the high atmospheric pressure at that altitude.

Finally, I think it would be better to use only 2 font sizes and not make the question so large.

5.  Goldik Rivka (2019-12-20 15:00:00)
To Debby

Thank you for your comments. I am going to adopt all your suggested changes. Regarding to the movie, I filmed it in my last travel to Sdom where I work. The reason I put it is because you can see the sign of the Sea level when you pass through.



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