User:Dtam Gupta/sandbox

Measurement in Science  We measure different physical quantities for different purposes in our daily life. We use different reference standards for different physical quantities. When we buy biscuits and other packed materials, there is no need to measure them in the shop because they are already measured in the factories when they are made. The science of measurement is called metrology. In this unit we will study different types of fundamental and derived units and the relation among them.