Question

1. give an example of a situation where knowing the density of a substance would be important.

Explanation:

Density is crucial in material - selection for construction. For example, when building a bridge, engineers need to know the density of construction materials like steel and concrete. Lighter - density yet strong materials can reduce the overall weight of the bridge, saving on costs and improving structural efficiency. Another example is in shipping. Knowing the density of cargo helps in determining how much can be loaded onto a ship without overloading it, ensuring safe transportation.

Answer:

In construction for material - selection (e.g., bridge - building) or in shipping for cargo - loading.