What is another example of a gas in your classroom? I know air would be one but I can't think of what would be another one present in a classroom.
Thanks...
3 answers
http://www.google.com/#q=gases+air
Also carbon dioxide
http://dictionary.reference.com/browse/carbon+dioxide
http://dictionary.reference.com/browse/carbon+dioxide
The air in your classroom is an example of a(n) ___.