26°F

Trial 1                                                                                                                                                        Trial 2

This graph starts a little less that 20.3 and dips down to a little                               
less than 20.2.  After that is goes up than fall down at a slower
rate than before.

This graph starts lower than 20.3 and drops quickly than raises and falls again at a steady rate.

20°F

Trial 1

In the first few seconds the percent of oxygen fell starting at a little less than 20.3 but after a little time it raised and than started to slowly decreasing again. 

Trial 2

 

 In this graph, it starts at 20 percent oxygen and falls down than stays for a few seconds and than raises up and stays at a steady rate.