Hand Warmer Project Description:
For this project our task was to create a cost efficient but effective hand warmer that could be sold to San Marin Sports fans. We were given the choice of six different salts to use in making our hand warmer. After running trials on all of them, we chose to use Lithium Chloride (LiCl). My group chose lithium chloride because it had the greatest temperature change. It is fairly pricey, but it's very efficient. It is also a safe ionic salt, calcium chloride on the other hand can be harmful when it's in large quantities. Although calcium chloride would have been cheaper than lithium chloride, my group chose to use lithium chloride because it worked more efficiently and was safer as well.
Presentation:
final Product:
Our Final Project Included:
~4 grams of Lithium Chloride
~Initial Temperature=18.7 degrees Celsius
~30 mL of water
~Final Temperature=36.2 degrees Celsius
~Measurements= 13 cm by 10 cm
~4 grams of Lithium Chloride
~Initial Temperature=18.7 degrees Celsius
~30 mL of water
~Final Temperature=36.2 degrees Celsius
~Measurements= 13 cm by 10 cm
Reflection:
I thought that my group worked efficiently on this project. We used our class time wisely. We tested many different salts and created multiple prototypes until we finally came up with our final product. An area of improvement was definitely our pricing. I think that we could have found better deals on our materials and that could dramatically decrease the cost of each individual unit. We could also possibly figure out a way to increase our production speed. Right now, our product takes a while to make because we have to put the salt inside of the small water balloon (which takes longer than you think), and we also have to make the seals on the side of the Ziploc water tight. My group could figure out a faster way to make each unit in a more timely manner and that would definitely help our production rate.