Let's take a look at the things, animals, and objects around us. Are they all the same size? No, They are not. The sizes of the various entities are also different. We find it by weighing the mass of things around us. The weight of things is measured with double pan balance scales, which are used to weigh vegetables in grocery stores or in the markets. How can you determine that an apple is heavier than a pencil? You can simply put them on the scale and measure their weights and say that an apple is heavier than a pencil.