You can then compare the bubble qualities of skim, of skim plus cream, of whole, and of whole plus cream. Straw A could get more air than straw B, straw B could get more air than straw A, or straw A and straw B could get the same amount of air. If you blow the same amount of air through both straws, you expect to get the same amount of bubbles. If you blow different amounts of air, you expect different amounts of bubbles. Now, do the experiment and observe the bubbles.
Many people find that when they first compare skim and whole milk, both bubble about the same.
On the next page are some things to consider and test. Go to page three of better bubbles. Go back to page one of better bubbles.