Comparison of Heat Storage in Water Bottle Brands

Student: Jia Mohan
Table: 8
Experimentation location: Home
Regulated Research (Form 1c): No
Project continuation (Form 7): No

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Project files

Research Plan:

Many water bottles are vacuum insulated including Hydroflasks, Stanleys, and Yeti’s. Vacuum Insulation is where a small gap of air is set in between the bottle’s inner walls which reduces conduction and keeps the drink hot or cold for a long time. This also keeps the outside of the water bottle from becoming wet and creating marks. Heat travels through air very easily so insulation is necessary to keep the drink at the same temperature. Some water bottles still use a plastic coating or layer because it lowers the amount of heat transfer. Yetis are known to keep drinks cold or hot for a very long time and this tumbler is double-vacuum sealed unlike Stanleys and Hydroflasks which only have one vacuum seal. I will take three of the most popular water bottles, a Stanley Quencher, a Yeti Tumbler, and a Hydroflask, and see which one keeps my water the warmest for the longest amount of time. 



  • Put 6 cups of boiling water into each bottle at an interval of 10 minutes. 
  • Set a timer for 2 hrs
  • After 2 hours check the temperature 
  • Record any temperature changes in a table
  • Continue for 12 hours, measuring and recording every 2 hrs
  • Repeat the whole process twice. 

Data Analysis

  • Record the temperature of the 2hr intervals  in a table
  • Calculate the average time at the 2hr intervals for each bottle
  • Graph the results plotting the hours and the temperature
  • Analyze the graph

Whichever water bottle temperature dropped the least will be named the most insulated. I will research the price of the water bottles and analyze if this is reflected in the results.

Questions and Answers

1. What was the major objective of your project and what was your plan to achieve it? 
For this project, I wanted to determine which water bottle would keep my drink hot and for how long. I planned to test 3 different brands, fill them with water, and see how the temperature of the water changed over 12 hours. My drink would get cold in certain water bottles after 2 hours and I wanted to see which one kept the water the hottest for the longest and how the cost reflected the performance.

2. What were the major tasks you had to perform to complete your project?  The forms that I needed to fill out were some of the parts that I was stressed about near the due date. The weekend before the science fair I did my 2nd test and I was nervous that my experiment would fail and I wouldn’t have factual data. 

 3. What is new or novel about your project? This is my first year doing a science fair so this whole process was new to me. I have not seen a study done about three popular water bottle brands comparing their effectiveness as well as their price differences. For example, the Stanley Quencher was the most expensive but it was second best with Yeti very close behind it. I would say that I am the first person I have seen who has compared these specific brands. Each of these brands has run its own tests but they may have some bias and make some of their bottles look like they can hold water for much longer than they actually can. Before choosing my topic, I looked at previous science fair projects and didn’t see any similar projects in their testing and products.


4. What was the most challenging part of completing your project?

I tested three water bottle brands and my dad has a Yeti so I was going to borrow it for my experiment. The weekend I was going to do my first experiment I realized he had taken it on a work trip and wouldn’t be home for another week. I needed to do a test that weekend or I wouldn’t have completed my project. So I tested a Stanley and a Hydro Flask so I could still test without falling behind. Since I needed to do two tests on each water bottle, for the second test I did I used one Stanley, a Hydro Flask, and two Yeti’s so that I could compensate for missing a week. This may have caused a different outcome but I still found similar temperature changes. I learned that next time I should ask my dad if he is going on a trip and if he is to ask him for his Yeti before he leaves.

5. If you were going to do this project again, are there any things you would do differently the next time? Next time I would use one Yeti per test so I got more accurate results. I would also make sure that all the water bottles have the same lid because I believe that the results were affected. After all, the Hydro Flask had a covered lid with hard plastic, while the Yeti’s had suctioned lids with a sip lid and the Stanley had a straw which I covered with tape after realizing it was releasing too much heat. 

 6. Did working on this project give you any ideas for other projects?  This project gave me the idea to do this experiment again but use 3 types of Hydroflasks because they were the brand that kept the water the hottest for the longest time. This would see which type of bottle from the “best brand” keeps water the hottest. I could also repeat this experiment using cold water with ice cubes, giving me a different result.