"Is it economically feasible to use liqufied air as the potential source of energy to drive a piston or turbine engine? Would the energy out be greater than the energy required to make the liquid air?"
-Jeff (age 25)
Dropping Balls On Guitar Strings
Understanding Why Light Travels At C
Properties Of Graphite
Keeping Time In Space
Spinning And G-forces
Speed Of Photons
More Quantum Probability Functions
6588 questions have been answered online since 1998 by volunteers from the Department of Physics at the University of Illinois' Physics Van outreach program. We've tried hard to make this the most reliable physics Q&A site on the Web, but no site is perfect, as we explain on this note. Our Baloney feature provides examples of how shaky many other sites are.
If you'd like to ask us a new question, not already covered, please read our answering guidelines first. We try to answer as many questions as we can, but it's not always possible to answer them all. Questions from kids are especially welcome.
Although we recommend not using our informal site as a cited reference, students who are in a rush and can't find a more proper peer-reviewed source can check our citation information section.