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In conclusion, my hypothesis was if the Diet Coke is colder, then the physical reaction to the Mentos is greater. My hypothesis was not supported by my experiment, because in reality it was just the opposite. What my experiment showed was that the hotter the Diet Coke is then the greater the physical reaction is to Mentos. The Diet Coke that was 37.8 degrees centigrade (°C), which was the hottest temperature, had the highest eruption of all when you put in 2 Mentos. This means that if the Diet Coke is hotter, then the physical reaction to Mentos is greater, as shown by the higher eruption.

One problem encountered when doing this experiment was getting all the Mentos into the bottle. Originally the idea was to drop 4 Mentos into the bottle of Diet Coke, but the eruption occurred so fast that only 2 Mentos dropped in and it was impossible to drop in the other 2. So, the experiment’s design was changed to only have 2 Mentos dropped into each bottle of Diet Coke, instead of 4. If I had to repeat the experiment in the future, I would design a better tube so all 4 Mentos would drop into the Diet Coke bottle. Now that I have done this experiment, I would like to know what would happen if you tried this experiment with other kinds of sodas. For example I would compare the physical reaction of Mentos to Pepsi, Mr. Pepper, Orange Fanta, Sprite, Coca Cola, and 7-Up.

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As can be seen below in Table 1, the 12.8 °C Diet Coke, which was the coldest of all, had an eruption that was 66 centimeters (cm) high when the 2 Mentos were dropped in the bottle. The height of this eruption was the lowest of all. After the eruption, there was only 899 milliliters (ml) of Diet Coke left in the bottle, which was 11.4 cm of Diet Coke as measured with a tape measure.  The 22.8 °C Diet Coke (room temperature) had an eruption of 228.6 cm high when 2 Mentos were dropped in the bottle. This eruption was higher than the eruption of the coldest temperature (12.8 °C) Diet Coke. There was 798.5 ml of room temperature (22.8 °C) Diet Coke left after the eruption, which was 10.2 cm as measured with a tape measure. There was less Diet Coke left in the bottle at room temperature (22.8 °C) than the cold Diet Coke (12.8 °C).  The 37.8 °C Diet Coke, which was the hottest temperature of all, had an eruption of 284.5 cm. This eruption was the highest of all the different temperatures of Diet Coke. After the eruption, there was 774.8 ml of Diet Coke left in the bottle at 37.8 °C, or 9.2 cm as measured with a tape measure. There was less Diet Coke left in the 37.8 °C of Diet Coke after the eruption than all of the others.

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The purpose of this project is to find out how temperature affects the physical reaction of Diet Coke to Mentos

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1.      Take an index card and roll it up to make a tube that matches the circumference of the Diet Coke bottle opening.

2.       Place the bottle of room temperature Diet coke outside on a flat surface at the base of a wall of a building.

3.      Set up camera so it is at the correct height to videotape the experiment.

4.       Open the cap of the Diet coke bottle.

5.      Place the tube (rolled up index card) on the flat index card.

6.      Put two Mentos into the tube and the flat index card underneath so the Mentos do not fall out.

7.       Turn the camera’s video recording on.

8.      Place the flat index card and tube with Mentos on top of the Diet Coke bottle, making sure the tube is right above the bottle opening. Pull out the index card so the Mentos drop into the bottle.  Step back from the bottle.

9.      When the Diet Coke stops erupting, turn camera off.

10.  Take away the bottle of Diet Coke.

11.  Pour out some Diet Coke in the cup. Take the thermometer and measure the temperature of the Diet Coke.

12.  Pour the Diet Coke in the cup back into the bottle.

13.  Take the measuring tape and measure how much Diet Coke is left in the bottle.

14.  Pour the Diet Coke into a measuring cup and measure the volume of the Diet Coke that is left in the bottle after the eruption.

15.  Repeat this exact same process with the warm Diet Coke and then again with the cold Diet Coke.

16.  Watch the videos of the three eruptions to see how high the eruption was for the room temperature Diet Coke, the warm Diet Coke, and the cold Diet Coke against the building wall.

17.  Estimate the height of each eruption by measuring the building wall with a tape measure.

18.  Recycle the empty plastic bottles of Diet Coke.

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3 2-liter bottles of Diet Coke
2 index cards (one rolled into a tube)
Tape (to tape rolled index card
1 roll of Mentos
an outdoor area next to building mall (that has lines or made up of wars with well defined lines)
video camera with a helper to take images (videos + pictures)
Thermometer
Tape measure
Measuring cup
3 plastic cups

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The number of Mentos dropped (2)
The amount of Diet Coke used (2 liter)
the outside temp
the time of day
the method of dropping the Mentos (with a tube made of an index card)

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The physical reaction of Diet Coke to Mentos

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The temperature of Diet Coke (1st bottle chilled in the fridge to 12.8 C , 2nd bottle at room temperature 22.8 C, 3rd bottle heated to 37.8 C.

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If the Diet Coke is colder, then the physical reaction to the Mentos is greater

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Which Temperature of Diet Coke causes a greater physical reaction to the Mentos