AboutSteve Nelson Expertise Ph.D. from Duke University in Physics. Explaining odd observations that seem counterintuitive, energy science, nuclear physics, nuclear astrophysics, and alternative theories of physics are my specialties. Homework I may be able to give you a start on but not answer (please don't ask if that's what you want).
Experience I'm a physics professor, research in nuclear astrophysics. I teach physics, radiation safety, vacuum technology, and answer tons of questions as I tour schools encouraging students to consider careers in science.
Education/Credentials Ph. D. from Duke University in physics, research in nuclear astrophysics reactions, gamma-ray astronomy technology, and advanced nuclear reactors.
Expert: Steve Nelson Date: 7/24/2008 Subject: air as an insulator
Question why is air such a good insulator?
Answer Short answer: density. Air has about a thousand times less molecules/volume to conduct heat.
Caveat: it's not always a great insulator. It's good if there's no convective flow (such as tiny air spaces trapped in styrofoam), but blowing air conducts heat much more efficiently. Still air is the good insulator, moving air can physically transport high-velocity (hot) molecules more efficiently and isn't as good of an insulator.
