posted by Carter .
How are gases and vapors different?
Most use gases and vapors interchangeably. I looked up both words in my copy of Webster's and found gas listed vapor as a synonym and vapor listed gas as a synonym. However, some of the definitions for vapor listed "particles as in exhaltation in cold air, cloudy, misty, foggy" etc. So I suppose the true meaning depends upon how it is used in the sentence.
Carter, type your question into booble exactly the way you've presented it here. The 7th entry will give you a google answer. It's fairly long, but the posters definitely knows the subject. Their answer is quite lengthy, but I think if you skim it a couple times you'll see that they give several differences between them. Not being a chemist, I was unaware any difference existed. Cleary, chemists use their language with precision too.