Post Your Answer
1 year ago in History of Physics By Varun
What even is energy, and do physicists actually agree on it?
I keep reading that energy isn't a "thing" but a mathematical tool. Is that actually settled, or are physicists still arguing about what energy really is?
All Answers (1 Answers In All)
By Akash Answered 10 months ago
It's settled for calculation, unsettled for philosophy. In physics, energy is a conserved quantity—a number that stays constant over time for an isolated system. Thanks to Noether's theorem, we know this conservation arises from a deep symmetry: the laws of physics don't change with time. So energy isn't a substance or a fluid. It's bookkeeping. That said, historical puzzles (like where energy lives in an electromagnetic field) still spark interpretive debates. We know how to use it. What it is remains a lovely, open question.
Reply to Akash
Related Questions