SCIENCE Generally we know various subject which are related to Science, but the main part of Science are, 1. Physical Science 2. Life Science also Physical Science is divided in two parts 1.Physics 2 Chemistry Today we will describe about System of Measurements and Measuring Devices System of Measurements and Measuring Devices First we have to learn the difference between which think we can measure and what we measure Actually we dont measure the think, we just measure their mass, volume, density, weight etc. Physical Quantity: Whichever we can measure they are called Physical Quantity. Ex.-Length, Width, Height, Time, Mass, Temperature etc. not Wood, Stone, Aggregate, Water, they are the Particle and we Measure their Physical Quantity Physical Quantity is divided in Two parts 1.Scalar Quantity 2. Vector Quantity generally in our life we will see that few quantity never depends on direction,just like mass off a Particle. ...