We can measure each of them, and we know that the total value between all of the various forms stays constant, and just like every other every constant, measurable thing it gets a name energy. There’s this quantity, that takes a lot of forms (physical movement, electromagnetic fields, being physically high in a gravitational well, chemical potential, etc., etc.). So, energy can change from one form into another into another into another, etc., but the question remains: what is energy? The answer to that is a little unsatisfying. Some form of energy without matter: that happens. It’s “matterless”, sure, but that doesn’t mean that electromagnetic fields (light) are any closer to being pure than, say, gravity fields (another, very different, massless form of energy). Light is about the closest anything comes to being pure energy, but it’s not pure energy so much as it’s one of the several kinds of energy that isn’t tied up in matter. For example, when “energy is released” in an explosion (most explosions) that energy mostly takes the form of kinetic energy (things moving and heat). “Pure energy” shows up a lot in fiction, and most sci-fi/fantasy fans have some notion of what it’s like, but it isn’t a thing you’ll find in reality.Įnergy comes in a hell of a lot of forms, but they’re all pretty mundane.
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