Experiment 13: Urea Freeze Pack
date | aim | method | materials & equipment | results | conclusion
Date
9 March 2010 by Quest 2, to link in with Chapter
13 of our book.
Aim
To see if a urea (carbamide) and water "freeze pack" really
gets to freezing temperatures.
Method
- Get a glass of tap water.
- Measure temperature of water.
- Pour urea beads into a beaker.
- Pour water over beads and stir to mix.
- Measure temperature of urea and water mixture.
Materials & Equipment
- Urea beads (called carbamide on freeze pack packet).
- Water.
- Beaker.
- Glass.
- Thermometer (multimeter with thermocouple).
- Stirring stick (pocketknife blade).
Results/Observations
| Item |
Start of Experiment |
Peak of Experiment |
End of Experiment |
| tap water |
25.6°C |
26.2°C |
26.3°C |
| urea/water mixture |
– |
9.2°C |
13.3°C |
Conclusion
- Urea in water is effective in dropping the temperature of the water.
- The product is misleading as the temperature it gets to is cold but
well above freezing. It is not a freeze pack.
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