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  1. Title:
  2. Diffusion Through Different Water Temperatures (Cold-Diffusion)
  3.  
  4. Abstract:
  5. This experiment is about the diffusion of red food dye through water of different temperatures, with the goal being to find the difference in the time for the liquid to reach the bottom of the cup. Cold water, Room temperature water, and Hot water were used in this experiment. The hypothesis was that cold water would take the longest time to diffuse to, as it’s molecules had the least energy, which would slow the red dye on it’s way down. It was found that contrary to the hypothesis, Cold water was the fastest, and hot water was the slowest to reach the bottom of the cup. This is likely because in the cold water, the water molecules don’t have energy moving them in all different directions, which causes gravity to be the strongest force, making the dye move straight down.
  6.  
  7. Introduction:
  8.  
  9.  
  10. Materials and Methods:
  11.  
  12. Pour 237mL of Room Temperature Water into a cup around 6 inches tall, and 711mL in volume. Put a paper towel over the cup, making sure it’s taught around the edges. Pour 5mL of food coloring into a measuring cup, and on the count of 3 seconds, pour the food coloring onto the paper towel and start the stopwatch. Stop the stopwatch when the red dye visibly touches the bottom of the cup. Repeat these steps, changing the Room-temperature water to Hot and Cold water. You can procure hot water by warming the room temperature water in a microwave on the low setting for one minute. You can get cold water by leaving the room-temperature water in the freezer for 1 hour.
  13.  
  14. Results:
  15.  
  16. - Cold water - Red Drink 6.41 took around seconds to reach bottom of cup
  17. - Room-Temp Water - Red Drink took around 8.42 seconds to reach the bottom of the cup
  18. - Hot Water - Red Drink took 11.63 seconds to reach the bottom of the cup
  19.  
  20. Discussion:
  21.  
  22.  
  23. Conclusion
  24.  
  25.  
  26. ——————————
  27.  
  28. - Cold water - Red Drink 6.41 took around seconds to reach bottom of cup
  29.  
  30. It came down in a few delicate little rings that fell slowly to the bottom
  31.  
  32. The rings went straight down, and were very much visible at the bottom of the cup
  33.  
  34. - Room-Temp Water - Red Drink took around 8.42 seconds to reach the bottom of the cup
  35.  
  36. It came down as a slow cloud that widened from bottom to top
  37.  
  38. It slowly turned invisible with the rest of the water as it went down, but was mostly visible at the bottom of the cup it took a long time to turn mostly clear
  39.  
  40. - Hot Water - Red Drink took 11.63 seconds to reach the bottom of the cup
  41.  
  42. It came down similarly to the room-temp water, though the red drink couldn’t be seen as clearly
  43.  
  44. It diffused into the water very quickly, being almost invisible with the water as it reached the bottom
  45.  
  46. Materials:
  47. * Purified Drinking Water
  48. * Red Food Coloring
  49. * Paper Towels
  50. * Cup
  51. * Measuring Cup
  52. * Stop Watch
  53.  
  54. Instructions:
  55. 1. Pour a Cup of Room Temperature Water into a cup around 6 inches tall and 711mL in volume.
  56. 2. Put a paper towel over the cup, making sure it’s taught around the edges
  57. 3. Pour 5mL of food coloring into the measuring  cup
  58. 4. On the count of 3, Pour food coloring onto the paper towel and start the stopwatch.
  59. 5. Stop the stopwatch when the red dye visibly touches the bottom of the cup
  60. 6. Repeat, only changing Step 1 to Hot and Cold water.
  61.  
  62. Hypothesis:
  63. I believe the Red drink will take the longest time to reach the bottom of the cold water because the water molecules are moving slower
  64.  
  65. Was your hypothesis correct?
  66. No, my hypothesis was incorrect, because the cold water actually took the shortest time for the red drink to reach the bottom.  I think this is because the water molecules have less energy moving in all different directions when it’s cold, so gravity is the strongest force acting upon the red drink, pushing it straight down.
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