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Quantities and Unit

October 18, 2010

Fundamental and Derived Quantities

You have learned that measuring is to compare a physical quantity with a similar quantity used as a standard unit. A quantity which can be measured is called a physical quantity such as length, mass, and time. Read more…



October 14, 2010

roll meter

In science, measurement is the process of estimating or determining the magnitude of a quantity, such as length or mass, relative to a unit of measurement, such as a metre or a kilogram. The term measurement can also be used to refer to a specific result obtained from the measurement process. Read more…


October 13, 2010

Archimede’s Principle

Back to the Ancient West


ArchimedesArchimedes (298 BC- 212 BC) was the greatest mathematician of ancient times. A native of Syracuse, Sicily, he was killed during its capture by the Romans in the Second Punic War. Stories from Plutarch, Livy, and Polybius describe machines including the catapult, the compound pulley, and a burning-mirror invented by Archimedes for the defense of Syracuse. Read more…

Archimedes low

October 13, 2010

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The forces at work in buoyancy Read more…

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October 12, 2010

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