what is energy? I hear scientists saying mass can be CONVERTED into "pure energy" but I don't understand what they mean. I'm sure energy has no physical form, I concluded it was a way to describe the movement of a particle, was I right?

replies for scientists will be greatly appreciated

Google
Wikipedia
http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html
http:/www.motionmountain.net/

Save the drama for your mama. Get down and push.

Excellent link AL.

Lots of good stuff!
jw