Arab and Turkish Invasions

Turkish Invasions The Turks got the upper hand over the caliph of Baghdad in the 8th and 9th centuries. They were more aggressive than Arabs. They extended their dominion beyond Sind and... Read more »

Measurement and Measuring Instruments

Unit A unit is the standard quantity with which unknown quantities are compared. For example Kilogram is the unit of measuring Weight. SI system of Units Derived Quantities and their Units Fundamental... Read more »