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Mrs. Darden's Science Class in Thomson, GA
Did you know that you can make water more dense?
- clear straws
- clay
- salt
- blue, red and yellow food coloring
- 3 plastic cups filled with water
- eye droppers
- Add a few drops of blue food coloring to one of the cups filled with water. Add red to the other cup and yellow to the third cup.
- Then, add different amounts of salt to each cup. Add lots of salt to one color, a medium amount of salt to the other, and no salt to the last cup.
- Using clay, make a base for the straw. Stick the straw into clay to keep it standing straight.
- Now, using the eye dropper, put drops of the different colored water into the straw. What happens?
- The different colors float on top of each other in the straw. That's because the more salt there is in the water, the denser the water is and the lower it will be in the straw. Density is one thing that makes things float. So, the color that floats at the top of the straw has the least amount of salt in it and is the least dense.
This is kind of complicated, so here's the science scoop again. The color with the most salt in it is the most dense, so it stays at the bottom. The color with a medium amount of salt in it is medium dense, and the color with no salt in it is the least dense.Keep experimenting with density. Think of a question that you'd like answered. Like, "What would happen if I added different amounts of sugar to the water instead of salt?" Make a prediction, test it out, and then share any discoveries you make at the ZOOMsci feedback section.
Amara, age 11 of Brooklyn wrote:
frist I put the red iquid in and it when to the bottom and the green stayed to the top and the blue stayed in the middle. some didnt move because of the density. some of there densitys were light and so were heavey like the red liquid.
Shukla, age 12 of Auckland, NZ wrote:
The first time I tried it, it didn't work. The second time it did work. When I finished it, the straw was very colorfull. I showed my parents - they were very amazed. Now I know that salt makes water more dense.
Erin, age 13 of Auckland, NZ wrote:
This is a really cool experiment! When I tried it first, I didn't put the amounts of water into the straw in order of density, so all the colours ran together. I tried it again, putting the amounts of water into the straw in the right order and it worked! So awesome!
Erin, age 13 of Auckland wrote:
This was a really cool experiment!!! The first time I did it I didn't put the densest amount of water in first, so all the colours ran together. I tried it again, putting the amounts of water into the straw in order, and it worked!!! So cool!!
Shukla, age 12 of North Shore City wrote:
The straw was very colorful. It was pretty. The first time I did it, it didn't work. So I tried again. The three different colors did dense on each other. As a final result I was very impressed of what came out in the end.
Julianna, age 12 of Auckland, NZ wrote:
I put the least salt in the blue one, the medium in the red and the most in the yellow, also I put in a green with no salt. I was amazed that it worked and the yellow was at top, then the red as medium and so on! Wow it was soo cool and interesting.
Abbey, age 12 of Auckland wrote:
It didn't work the first time so I tried it again without ridges in the straw and it worked!! It worked better with blu tack then it did with clay!! I had no yellow so I used green food colouring and it worked just as well!!
Aden, age 12 of Auckland wrote:
the water with the most salt kinda mixed together with the one with some salt but the one with no salt was separated. it was a fun experiment but it was a little boring watching the water.
Debbie, age 12 of Auckland wrote:
This experiment was so cool! The water with the most salt was at the bottom, then came the water with some salt and last came the water with no salt. I find this experiment very interesting.
Hannah, age 12 of Auckland, NZ wrote:
The colour with the most salt stayed at the bottem of the straw, the colour with a little bit of salt was in the middle and the colour with no salt was on the top.
Vishan, age 12 of North Shore City wrote:
the water with the least amount of salt floated at the top and the water with a lot of salt were at the bottom.
Millie, age 12 of Auckland, NZ wrote:
Well the saltier the water the lower it goes. I was so awesome even my parents were amazed. it is now in my memory.
Jamice, age 13 of Saint Louis, MO wrote:
it was great and it all worked out. i loved every minute of it, it was amazing. this was the best experiment that I ever had all year.
Rebecca, age 12 of Auckland wrote:
It was so cool and it worked. the colours all layered onto each other.
Patricia, age 12 of Auckland, NZ wrote:
I could clearly see the difference in the water densities.
Zarek, age 12 of Auckland wrote:
The water with the most salt in it sat at the bottom, then the one with no salt sat at the top. It looked really cool when I did it because some of the colours mixed a little bit.
Aya, age 12 of Auckland, NZ wrote:
sadly the experiment didn't work for me but I did it in the seperate cups and it actually show the result individualy when added salt.
Alice, age 12 of Auckland wrote:
The water with no salt in it was the most dense and the water with the most amount of salt was the least dense.
Park, age 12 of North Shore City wrote:
That I most put salt in it was stay at bottom, and middle was stay at middle and least was stay at top. and I think if we put sugar in the water exactly this experiment I think same results will happen.
Amanda, age 12 of Auckland wrote:
it didn't work for me. All the colours mixed together.
Bryar, age 12 of Auckland, NZ wrote:
I added the colours to the straw and made green not salt, blue medium salt, then red the most salt. I put green in first, blue next, and red last. Even though I put in red last, at the top of the straw, it came to the bottom because it wa most dense.
Niyati, age 12 of Auckland wrote:
when I did the experiment it really did work. the food coloring with the most salt was the densist and was at the bottom and the food coloring with the least salt was at the top and was least densist. I added different liquids and i found out that the densist one from my liqids was oil which stayed at the bottem.
Daryan, age 12 of Auckland, NZ wrote:
the blue went to the top, the yellow went to the bottom, and the red went in the middle. it look so awesome.
Jayden, age 12 of Auckland wrote:
The one with the mosy salt stayed at the bottom. When I added the one with the second amount of salt it just floated above the saltier one and didn't mix. But when I added the one with the least salt as it sank it didn't rise to the top as the more dense one held it down!!!
Abbey, age 12 of Auckland wrote:
wow! this project is awesome it really works! the three different colors did dense on each other. The one with the most salt was at the bottom, the one with medium was in the middle and the one with no salt was at the top! this is awesome!!
Jason, age 12 of North Shore City wrote:
The three different colors did dense on each other. The one with the most salt was at the bottom, the one with medium was in the middle and the one with no salt was at the top! I was super surprised.
Tnis wrote:
The cup with the most salt went to the bottom and the cup with no salt went to the top!
Kelly, age 12 of Westmont, IL wrote:
wow! this project is awesome it really works! the three different colors did dense on each other. The one with the most salt was at the bottom, the one with medium was in the middle and the one with no salt was at the top! this is awesoem!!
Danielle, age 10 of Mckenzie, AL wrote:
At first, I used a regular clear cup and the colors mixed. Then I used a straw and clay like the directions said and it worked, it even impressed my parents. It was so cool!!!
Kelly, age 13 of Westmont, IL wrote:
it was awesome! it really works. I used the materials and followed all the steps and it really work. It densed and it was fun too!
Claire, age 9 of Los Angeles, CA wrote:
Mine actually worked!
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