# Quantum Energy Explained

## Demystifying the science of quantum physics

# TL;DR

**In quantum physics, energy is discrete (chunky).**

*In classical physics, conforming to our intuitions, energy is continuous, meaning it can change smoothly. Imagine the differences between classical and quantum energy as a slide versus a staircase. Classically, changes in energy can be arbitrarily small. Whereas quantumly, energy only comes in discrete amounts — called quanta, which are also *small *but ultimately finite.*

# How did this all come about?

Let’s very briefly play back the tape.

1. **Planck’s Quantization of Energy (1900)**

In **1900**, **Max Planck** introduced the idea that energy is quantized to solve the blackbody radiation problem. He proposed that energy is emitted or absorbed in discrete units, or **quanta**, and introduced **Planck’s constant**.

This was a major theoretical step, but at the time, it was more of a mathematical fix than a fully understood physical principle.