In physics, intensity is the power transferred per unit area, where the area is an imagined surface that is perpendicular to the direction of propagation of the energy. In the SI system, it has units watts per square metre (W/m 2).
The Ancient Greeks spoke Ancient Greek with three different major dialects: Aeolic, Doric and Ionic. They were the first Europeans to both read and write with an alphabet. This alphabet eventually led to the development of all modern European languages.
Greek belongs to the Hellenic branch of the Indo-European language family, and is spoken by about 13 million people mainly in Greece and Cyprus, where it is an official language. Greek is also recognised as a minority language in parts of Italy, and in Albania, Armenia, Romania and Ukraine. Greek was first written in Mycenae with a script known as Linear B, which was used between about 1500 and 1200 BC. This variety of Greek is known as Mycenaean. On Crete another script, known as the Cypriot syllabary, was used to write the local variety of Greek between about 1200 and 300 BC.