Specific modulus is a fancy way of saying how strong something is compared to how much it weighs. Imagine you are playing with two toys: one is a big toy that looks very strong and the other is a small toy that looks weaker. If you pick them up, you might notice that the big toy is heavier than the small toy, but you might also notice that the small toy is easier to bend or break than the big toy. This is because the big toy has more specific modulus, which means it is stronger compared to its weight.
Specific modulus is important in engineering because it helps us figure out how strong materials are without having to worry about how much they weigh. For example, let's say we are building a bridge and we need to choose between two different types of steel. One type of steel is very heavy but also very strong, while the other type of steel is lighter but not as strong. We can use the specific modulus to compare these two types of steel and figure out which one will be better for our bridge.
Overall, specific modulus helps us choose materials that are strong but also efficient and lightweight.