Here we discuss a sharp definition of the narrow concept of emergence in physics; we give a mathematically precise meaning to the notion of ‘qualitative difference.’ We propose the following ...

I write about physics, science, academia ... that a proper treatment of moving objects requires a clear definition of what it means to talk about separated events happening at the same time.

Does that mean we can unite all behavior under physics? Absolutely. Our narrow definition of the discipline is something that’s happened in the past hundred years, thanks to the immense impact ...

This new standard is the definition of the kilogram ... Oh, just to be clear, electrons don't use special rules of physics for super-small things. In fact, everything goes by these quantum ...

The air drag force also depends on other stuff—like the density of the air and the ... Now for some more physics—the definition of work. If a force is pushing on an object over some distance ...

Here’s how it works. The Theory of Everything is an overarching hypothetical framework that would explain the physics of the entire universe in a single equation. But unifying theories that ...

Solids also have a high density, meaning that the particles are tightly packed together. In a liquid, the particles are more loosely packed than in a solid and are able to flow around each other ...

We’re going to talk about density, which is an important concept in science and in meteorology. Here's what you need to do this experiment: 2 glasses 2 eggs Water Salt Spoon to stir with To ...

Technology advances: the energy density of lithium-ion batteries has increased from 80 Wh/kg to around 300 Wh/kg since the beginning of the 1990s. (Courtesy: B Wang) Researchers have succeeded in ...