Making rough estimates of physical quantities is useful

So that you can see if the answer to a problem makes physical sense.

Explanation:

Examples of this would be when you decided to choose a box that you are going to use to place your rice + Vegetables for lunch.

In order to do this, you won't necessarily count the amount of rices and vegetables and compared it to the box, but you are most likely will make a rough estimates of the physical quantities to choose the box,.

it is going to be account a

jupiter is mainly composed of hydrogen and helium just like a star. spectral analysis of jupiter has revealed that in addition to hydrogen and helium, the planet is made of water, methane and ammonia. those elements are in trace amounts. the core of the planet is thought to contain some rock and metallic hydrogen. i hope this will give you the answer to your question! : d