this post was submitted on 25 Jul 2025
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The famous equation includes momentum so I always chuckle when they only show E=mc2
You certainly know it, but sharing it for the ones who don't:
The full equation is
E² = (pc)² + (m₀c²)²where E, p, c, m₀ are respectively: energy, momentum, the speed of light, inertial mass. The(pc)²part is kind of a big deal, because otherwise massless particles (like photons) would have no energy.If p = 0, then the equation simplifies into that famous E=mc².
What I think is funny is that if you assumed E=mc^2 for all particles, then that would mean that red light is lighter than blue light.
This, too: if E = hc/λ and E = mc², then we can combine both as hc/λ = mc². Rearranging this shit you get m = h/λc. Since h/c = 2.2*10⁻⁴²kg*m, you'd get:
...BLOODY ULTRAVIOLET IS MAKING ME FAT!