Nick Davila’s Reviews > The Biggest Ideas in the Universe: Space, Time, and Motion > Status Update

“Energy isn’t a kind of substance, like water or dirt. It’s a property that things have, depending on what they are and what kind of situation they’re in. There is no “energy fluid” that flows from place to place. There are simply objects that have positions and velocities and other properties, and we can associate a certain amount of energy with them because of those facts.”