Polarography

Polarography is like fishing, but instead of catching fish, we catch electric signals. Imagine we have a fishing rod with a wire attached to it, and we put it into water with some chemicals inside.

When we turn on an electric current, it makes a little spark like a magic wand that travels along the wire and ends up at the fishing rod. As the spark flows through the water, it interacts with the chemicals and creates a bigger electric signal.

We can measure the size of this signal with a special device called a polarograph. By looking at the size of the signal and how it changes over time, we can tell what kind of chemicals are in the water.

This is really useful because it helps scientists study chemistry and figure out what kind of substances are present in different liquids. It's like using a flashlight to look inside a dark room and see what's there!