Question

give an example of a circumstance for which the use of a scientific model is practical

Answer 1

i didn't quite understand the question but if you are asking for a practical application of a scientific model, for example if you have a chemical equation of a compound and you want to visualize how it looks, you can generate a 3d model using a simulator to see how it looks or you can cut out your own foam balls and sticks and label them for example gray/black represents Oxygen, red represents hydrogen etc. It's a practical presentation of a chemical equation.