A bathhouse in Syracuse, a Greek colony in Sicily.
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Archimedes is credited with discovering how to measure the volume of irregular objects by using water displacement. This method allowed him to determine the volume of an object by measuring the amount of water it displaced when submerged in a container. The famous story goes that he made this discovery while taking a bath, leading to his exclamation "Eureka!" which means "I have found it" in Greek.
not that I know of, if I'm right, it was Archimedes.
To measure the volume of a large irregular solid, you can use the water displacement method. Fill a container with a known volume of water, then submerge the irregular solid in the water and measure the change in water level. The difference in water level will indicate the volume of the irregular solid.
First, measure the mass of the water in the bathtub using a scale. Next, immerse yourself completely in the water and measure the increase in water level using a measuring cup. This increase in volume of water displaced is equal to your body volume. Finally, apply Archimedes' principle which states that the buoyant force acting on an object is equal to the weight of the water displaced, to calculate your mass.
This is one of those ideas that have just grown with us as we developed from our ape-like ancestors. However, Archimedes is famous for figuring out how to measure it.
You might discover that solids have mass and they have volume.