Antoine Lavoisier

Hello! My name is Antoine Lavoisier, and I was a scientist who loved asking questions. I was born in the beautiful city of Paris, France, on August 26th, 1743. As a boy, I was curious about everything! I loved studying the stars, collecting rocks, and learning how plants grew. My family wanted me to be a lawyer, and I did study law, but my heart was always with science. I wanted to understand what the world was made of.

I set up my own laboratory to do experiments. It was my favorite place to be! I wanted to solve mysteries, like what really happens when a candle burns? People at the time had some funny ideas, but I wanted to find out the truth using careful measurements. In 1771, I married the brilliant Marie-Anne Paulze. She became my most important partner in science! She was a wonderful artist who drew detailed pictures of our experiments so others could understand our work. She also learned other languages to translate science books for me. We were a great team!

Together, Marie-Anne and I made some incredible discoveries. I found that when you burn something, it doesn't just disappear. The materials change form, maybe into ash and smoke, but all the parts are still there. Nothing is ever lost or created, it just changes! This is called the Law of Conservation of Mass. I also learned that air isn't just one thing. It's made of different gases. Around 1778, I gave one of those gases a name: oxygen. It's the part of the air we need to breathe and that helps things burn! A few years later, in 1783, I also helped name hydrogen. In 1789, I wrote a book with all my ideas, which became the first modern chemistry textbook.

My life was full of exciting discoveries, but it ended in 1794 during a difficult time in my country's history. I lived to be 50 years old. Even though my life ended, my ideas lived on. Today, people call me the 'Father of Modern Chemistry' because my careful experiments helped change the way we understand the world. Every time you learn about elements like oxygen in science class, you are using the discoveries that started in my laboratory a long, long time ago.