Effect of Antifreeze

The purpose of this experiment was to test the difference in heat transferability between different concentrations and chemical bases of antifreeze. The types of antifreeze chemicals used where ethylene glycol and propylene glycol. The concentrations of each were expressed in percent chemical by volume. The concentrations used were 100%, 50% and 25% chemical by volume. In order to recreate an engine setting, tubing was run through a hot water bath. The antifreeze was pumped through the tubing, and resulted in a rapid decrease in the hot water bath's temperature. The time required for a 10o C drop was monitored and recorded. A general hypothesis was formed, which stated that the 50% ethylene glycol would require the lowest amount of time to remove 10o C from the hot water bath. This hypothesis was supported by eh fact that our P-value turned out to be very close to zero. This gave very strong evidence against the all the means of the samples where not statistically equal. There was a significant difference between the heat transferability of ethylene glycol and propylene glycol. The concentration that required the least amount of time to remove the 10o C from the hot water bath was the 50% ethylene glycol by volume. Therefore, using 50% ethylene glycol in engine cooling systems is recommended.

Research Done By:

Alexander Harris
Fraser High School

Bradley Heath
Fraser High School