Which makes better bubbles, skim milk or whole?

(This is page five of a seven-page sequence. If you did not start with page one, please go back and start with page one now)

Factors Effecting Bubblicity:

Time

If time is important, then you'd expect that `older' whole milk would bubble less than `younger' whole milk (here 20 minutes is the difference between `older' and `younger').

If time is not important, then older and younger whole milk should bubble about equally, as long as all the other conditions are the same.

How can you test this?

To test the effect of time on bubblicity, put ice water in two shallow pans.

Now put one cup of cold skim and one cup of cold whole in the pan.

Blow in one cup of skim and one cup of whole simultaneously and note the results.

Twenty minutes later, blow in the second set of cups of whole and skim milk and compare the results to the first set of cups. How does the time you wait before you blow affect bubblicity?