Video Description -- Straw Pipeline Model
Materials:
• 5 Clear Straws
• 1 Clear Cup of a dark colored drink
• 1 Roll of scotch tape
• (Optional) Scissors
• (Optional) Food coloring -- to make your drink darker.
• (Optional) Marbles
Procedure
1. You will want to figure out how you would like to design how you will connect all your straws to make the pipeline. The below will be the simplest way but not necessarily the most effective way.
2. Unwrap all the straws. Experiment: Try different sized straws.
3. Place two straws together with their ends touching. You basically want this to be one big straw so make sure the holes line up.
4. Now you have to tape the connecting sides together. Use the scotch tape to wrap around. Make sure that there are no gaps and that the straws are still lined up. Once that is done, your two straws are now one.
5. Repeat steps 3-4 until all the straws are connected. Experiment: How many straws can you put together?
6. Once done, there should only be two openings. Experiment: Is it possible to have multiple openings? If so, how?
7. Fill a clear cup with your favorite drink (preferably dark). If the drink is not dark, you can use food coloring to make it darker. This is so that when you drink through the straw, you can see the drink.
8. Place one end of the straw in the cup, the other in your mouth. Your goal will be to see if you can drink from the cup with your long straw. Experiment: Can you make this into a pipeline that stretches across the room?
9. (Optiona) You can compete against friends, make it harder by adding marbles (simulating the pores in the ground), as well as experiment by turning the pipeline into a crazy straw.
Science
• Sucking is a matter of pressure. When you make an area of low pressure, the surrounding area becomes higher. The higher area pressure will push into the lower pressure area and equalize the pressure. You can imagine the area like a crowded lobby. In a crowded lobby, people are constantly moving and sometimes bumping into each other. Add more people and everyone has to start pushing more to get around. As soon as someone opens up an empty section, people will start to disperse into that section because they were pushed in.
• When we suck in air or drinks, we create an area of low pressure inside of us using our mouth's shape and our lungs. Try it out. What does your mouth do when you try drink something? Do you close your jaws to suck in more? What about your lips? Do you breathe out or in?
• Your diaphragm, the muscle under your lungs, will open up your lungs by stretching out.
• This means when you suck in drinks or in air, it's the area around that pushes the air/drink into the straw and into your mouth/nose.
• This becomes important when you drink from a long straw. As you suck air in, your low pressure area stops helping as much (you can only breathe in so much!) This can require you to stop and suck multiple times before the drink even reaches your mouth. You also have to remember that as the drink gets higher up the straw, you are pulling much more weight (the combined weight of the drink in the straw). This is similar to how it's much harder to drink thick malt than water. Knowing this, companies changed the straw shape to better support different drinks.
• When you are drinking your drink through a straw and your straw has a hole, you end up drinking a lot more air. Air moves easier than the drink and will move inside the straw much better than the liquid will.
Troubleshoot Tips
• Check to make sure your straw is immersed in liquid.
• Check for holes in the straw. Start at the connecting sections.
• Make sure not to bend your straw too much.
• The longer the straw, the harder it is to check for leaks.
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