Who is John Dalton?

John Dalton was a scientist who helped explain how tiny particles make up everything around us.

Imagine you have a big box full of different colored marbles, red, blue, green, and yellow. Each marble is like a particle, and the whole box is like a material, like a rock or a glass of water. John Dalton figured out that even though things look different on the outside, they’re made up of these tiny particles inside.

John Dalton thought of these marbles as atoms, the smallest building blocks of matter. He said each kind of material is made up of the same type of atoms, just like all the red marbles are the same. When you mix two materials together, it's like mixing red and blue marbles in a box, they stay separate but share the same space.

He also noticed that when things change, like when ice melts into water, the particles don’t disappear, they just move around more. This helped people understand how matter behaves in everyday life, from cooking to playing with toys.