The density of a solid material can be ambiguous, depending on exactly how it is defined, and this may cause confusion in measurement. A less common device for measuring fluid density is a pycnometer, a similar device for measuring the absolute density of a solid is a gas pycnometer.Īnother possibility for determining the density of a liquid or a gas is the measurement with a digital density meter - based on the oscillating U-tube principle. A very common instrument for the direct measurement of the density of a liquid is the hydrometer. The mass is normally measured with an appropriate scale the volume may be measured directly (from the geometry of the object) or by the displacement of a liquid. Measurement of densityįor a homogeneous object, the formula mass/volume may be used. Some scholars have doubted the accuracy of this tale, saying among other things that the method would have required precise measurements that would have been difficult to make at the time. This story first appeared in written form in Vitruvius' books of architecture, two centuries after it supposedly took place. As a result, the term "eureka" entered common parlance and is used today to indicate a moment of enlightenment. Allegedly, upon this discovery, Archimedes went running though the streets in the nude shouting, "Eureka! Eureka!" (Greek "I have found it"). Īrchimedes knew that the irregular shaped wreath could be smashed into a cube or sphere, where the volume could be calculated more easily when compared with the weight the king did not approve of this.īaffled, Archimedes went to take a bath and observed from the rise of the water upon entering that he could calculate the volume of the crown through the displacement of the water. In a famous problem, Archimedes was given the task of determining whether King Hiero's goldsmith was embezzling gold during the manufacture of a wreath dedicated to the gods and replacing it with another, cheaper alloy.
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