Square mil

Okay kiddo, imagine you have a piece of paper that is one inch by one inch. Now, let's pretend that we want to measure how much area is on that piece of paper. That's where square mils come in.

A square mil is a tiny square that is only one thousandth of an inch on each side. So imagine cutting that one inch by one inch paper into one thousand tiny little pieces, each one of those pieces is a square mil.

Now, let's say we wanted to measure the area of a bigger piece of paper, like a sheet of notebook paper. A sheet of notebook paper is about 7.5 inches by 10 inches, which is 75 square inches. But if we wanted to measure it in square mils, we would need to multiply that number by a lot! We would need to multiply 75 by 1,000 twice (once for the height and once for the width), which means there are 7.5 million square mils on a sheet of notebook paper!

So, in short, a square mil is a tiny little square used to measure area, and we use it when we want to measure really small things like wires or electronic components.