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International Young Naturalists’ Tournament

International Young Naturalists’ Tournament. 10. Straw Serbian team Regional Center For Talented Youth. Problem 10: What is the maximum length for a vertical straw such that you still can drink non-carbonated water through it? Still can drink cola through it?.

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International Young Naturalists’ Tournament

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  1. International Young Naturalists’ Tournament 10. Straw Serbian team Regional Center For Talented Youth

  2. Problem 10: What is the maximum length for a vertical straw such that you still can drink non-carbonated water through it? Still can drink cola through it?

  3. Measuring the height with water • Lung capacity • Torricelli's experiment

  4. Evangelista Torricelli (1608-1647) • Italian physicist and mathematician, best known for his invention of the barometer

  5. Torricelli's experiment(1643) • Glass tube and mercury • The tube was placed vertically in a wide pot, which also contained mercury • Vacuum • The height = 76 cm • Atmospheric pressure=hydrostatic pressure

  6. Calculation- water • Density of water • Perfect vacuum above the water in the straw • Atmospheric pressure at sea level = 101325 Pa • Atmospheric pressure = hydrostatic pressure

  7. Vacuum • At the highest point, the weight of water will equal the pushing force • And then we get:

  8. But, what if don’t have vacuum? • We should estimate • Capacity of lungs and equation of ideal gas

  9. Height of the straw –Coca Cola • The density of coca cola is • There is 2g of carbon dioxide in one liter of coke • The bubbles push the drink up • Atmospheric pressure + the pressure of bubbles = hydrostatic pressure • To measure the pressure of the bubbles, we need to use the equation for ideal gas

  10. Calculation

  11. Thank you for your attention!

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