What is Planck's law?

Planck’s law is about how hot things glow, like when you turn on a stove or hold a hot chocolate cup.

Imagine you have a bag of marbles that are all the same size, and every time you shake it, some marbles pop out. The more marbles come out, the brighter the light gets, just like how something gets brighter when it's hotter. This is what Planck’s law explains: how hot things send out light, but not just any kind of light, they send out different colors depending on how hot they are.

If you put a piece of metal in the oven and heat it up, it starts to glow red. If you keep heating it even more, it turns orange, then yellow, and finally white, like the sun! This is because when something gets hotter, it sends out more light, and that light has different colors.

Planck’s law helps scientists know exactly how much light a hot object will send out and what color that light will be. It's like having a recipe for glowing things, you just need to know the temperature, and you can figure out all the details of the glow!