What does it mean when we say that a formula models real-world phenomena?

A formula models real-world phenomena when it describes the relationship between the variables of a real life situation. We use formulas in our every day life, but maybe are not aware of it. Some examples of using math formulas in the real world are: - the most obvious example is that we use formulas in the grocery store (multiplication, estimation, percentages, ...

- we use formulas while baking (measuring ingredients, understanding ratios and proportions, converting metrics, ...)