Eureka (word) "Eureka! Eureka!" after he had stepped into a bath and noticed that the water level rose, whereupon he suddenly understood that the volume of water displaced must be equal to the volume of the part of his body he had submerged. (This relation is "not" what is known as Archimedes' principle—that deals with the "upthrust" experienced by a body immersed in a fluid.) He then realized that the volume of irregular objects could be measured with precision, a previously intractable problem. He is said to have been so eager to share his discovery that he leapt out of his bathtub
Eureka, Victoria the historic event of the Eureka Rebellion. This was the site where the rebel miners flew the Eureka Flag for the first time, a flag that has since become a symbol of the working class and trade union movement. The site is marked by several monuments and a museum called the Museum of Australian Democracy at Eureka (M.A.D.E), which opened in May 2013 and houses the original Eureka Flag, on loan from the Art Gallery of Ballarat. At the , Eureka had a population of 626. Civil disobedience in Eureka led to Australia's first and only armed civil uprising, the