Question

if you are using the si system you will ALWAYS use metres for measuring length I think false bc it's impractical to measure big lengths​

Answer 1

Answer:

No, it is true. Metre is SI unit of length. It is not necessary to be used everywhere, so we Can use km or miles in measuring long distances.

So, if we are using SI unit system then it is obvious that we will use metre m as it is the SI unit.