Ms. McKinney’s Class December 2014 KOOL ZONE Ms. McKinney’s Class December 2014

Our Question: What will cool a 20 oz. plastic bottle of soda the fastest? Placing it in a bowl of ice; placing it in a bowl of ice mixed with salt; or putting it in the freezer?

BACKGROUND: We chose this experiment because we needed something we could complete in the classroom. We didn’t want to spend a lot of money, and it needed to be carried out in a short amount of time. Several research choices were voted on by the class, and this was the winner.

Hypothesis: If three different cooling methods are tested, then a mixture of ice and salt will cool a 20 oz. plastic bottle of soda the fastest

VARIABLES: Independent (What we changed): The way we cooled the sodas Dependent (What we measured): Temperature of soda at set intervals Constants: (What must remain the same): Size of soda bottles, type of soda, amount of ice used, size of bowls used, material of bowls used, amount of time soda left in ice/freezer, thermometer, person measuring temperature in each soda bottle

3 20 oz. plastic bottles of Pepsi MATERIALS: 2 identical buckets ice iodized salt timer thermometer 3 20 oz. plastic bottles of Pepsi Freezer

PRoCEDURES: Assemble all needed supplies and materials Fill 2 identical buckets with same amount of ice Add 1 cup of Iodized salt to bucket number 2 and mix remove cap, take starting temperature of all three sodas individually and record, replace caps Simultaneously insert bottles into ice, ice with salt, and freezer, and start timer At set intervals, remove sodas, check temperature, record. Replace soda. (10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutes)

DATA:

GRAPH

CONCLUSION: We tested what would cool a 20 oz. plastic bottle of soda faster: placing it in a bucket of ice, placing it in a bucket of ice mixed with salt, or placing it in the freezer. After we assembled all of our materials, we filled one bucket with ice and one bucket with ice and one cup of Iodized salt. We then took the baseline temperature of each of our three sodas. We set our timer for 10 minutes, and we were ready to begin. We put the Pepsi’s in their places and started the timer. After 10 minutes, we removed the Pepsis and checked their temperatures. We repeated this every 10 minutes for One Hour.

All three Sodas started out at 60 degrees Fahrenheit All three Sodas started out at 60 degrees Fahrenheit. The Ice and salt mixture cooled the soda the fastest (-2 degrees) while the freezer cooled it the slowest (50 degrees). Our hypothesis is supported by the data because we said the ice and salt mixture would cool the soda the fastest and it did. We learned that when soda gets cold enough it turns to slush. If we did this experiment again, we would want three different thermometers. We wonder if the soda in the ice/salt mixture got colder than -2 degrees and perhaps the thermometer just couldn’t register a temperature that cold?