Nitric acid is a very strong and kind of scary chemical. It's made up of little pieces called atoms of nitrogen, oxygen, and hydrogen, all mixed together.
You might have heard of acids before, like battery acid or vinegar. Nitric acid is one of those kinds of acids, and it's even stronger than vinegar. This means that it can cause things to break down or dissolve.
Nitric acid is used for lots of important things, like making fertilizers for plants to grow and making medicines to help people feel better. But it also needs to be handled very carefully because it can be really dangerous and hurt the environment if it's not used correctly.
So even though it might seem interesting, it's definitely not something to play with or touch without getting help from a grown-up or a teacher who knows how to use it safely.