**Answer:** Archimedes

**Some extra relevant information:**

Archimedes, an ancient Greek physicist, famously discovered the concept of buoyancy while taking a bath. This incident, known as the “Eureka” moment, occurred in the 3rd century BC and has since become a well-known scientific story.

Archimedes was pondering over a problem given to him by King Hiero II of Syracuse. The king suspected that a gold crown he received was not made entirely of gold. The physicist was tasked with finding a way to determine the crown’s purity without damaging it. As Archimedes struggled with this problem, he decided to take a bath to relax his mind.

While getting into the bathtub, Archimedes noticed that the water level rose and spilled over the sides. This observation triggered a sudden realization in his mind. He realized that the water that spilled over was precisely equal to the volume of his submerged body. This discovery led him to understand the concept of buoyancy.

Excited by his newfound understanding, Archimedes jumped out of the bathtub and ran through the streets shouting “Eureka!” which means “I have found it!” in Greek. He had discovered a fundamental principle that would later be known as Archimedesâ€™ principle, stating that the buoyant force acting on a submerged object is equal to the weight of the fluid displaced by that object.

Archimedes’ discovery of buoyancy revolutionized the understanding of physics and had significant practical implications during his time and today. In addition to solving the purity problem of the crown, he used his principles to design various devices such as the Archimedes screw, which was used to pump water and irrigate fields.

The story of Archimedes’ bath is not only a significant scientific discovery but also showcases the power of observation and critical thinking. It serves as a reminder that great ideas can strike us at unexpected moments, even while relaxing in a bath.