This document discusses standards, measurement, and significant figures in physics. It defines measurement as determining scale, dimensions, or capacity with a standard unit. Principal standards are units that have been predefined, while derivative standards are obtained from principal standards. Examples of tools used to measure length, mass, time, current, temperature, light intensity, and amount of substance are provided. Rules of significant figures are also mentioned. The purpose is to help students learn about these key physics concepts and how to apply them in studies and daily life.