Planck constant

What is the Planck Constant?

The Planck constant is a very special number that helps scientists understand tiny particles, like atoms and bits of light called photons. It shows how much energy these little pieces have, depending on how fast they shake or vibrate. This idea was first introduced by a smart scientist named Max Planck in the year 1900.

Why Do We Need It?

Max Planck used this number to explain how objects give off heat and light. His work helped change how we think about physics. Later, another famous scientist, Albert Einstein, used this idea to learn more about the nature of light. For his important work, Max Planck even won a big award called the Nobel Prize in Physics in 1918.

A Number That Helps Us Measure

Today, the Planck constant is more than just a number. It helps us define one of the basic units we use to measure things, called the kilogram. Scientists use it to measure very tiny amounts of energy and matter very precisely. Even though the number looks complicated, it is very important for understanding the world around us, especially the very small particles that make up everything.