Because science has to be in measurement that can be generalized or used anywhere else in the world. The rest of the world does not use miles, so measurement has to be in km, which everbody uses. The scientific style of measurements is called SI system.

all your solutions so some distance for sure do now not incredibly comprehend what the size concern is. The length concern is a facet of quantum mechanics. In quantum mechanics the state of a gadget is defined via a functionality this is incredibly a superposition of attainable states. An operator acts in this functionality to supply the value for a actual volume – yet because of the fact the state is a superposition of attainable values then the operator can in basic terms provide the prospect of a sequence of values. case in point, electrons have spin. Spin may be in any course. In a 2 electron gadget, the spin of one electron would be in any course, and the different interior the different course. Now in case you ask the question “what’s the spin of electron A”, QM can in basic terms supply you with a danger for a solution. yet once you degree the spin you will get a different value, and given which you will comprehend the state of electron A and subsequently you will additionally comprehend the state of electron B (that’s the different). the subject incredibly is that for the duration of the previous the size the gadget grew to become into defined via a superposition of states, yet after it that’s in a widespread state. How did this modification? that’s thru no ability an commentary question, nonetheless. The term length is incredibly unfastened right here, and incredibly has no sparkling meaning. incredibly its approximately asserting whilst a macroscopic classical gadget (like a individual) interacts with a microscopic quantum gadget then something happens to the state functionality of the microscopic gadget. The macroscopic gadget would not would desire to be an observer, or clever or maybe sentient. It only has to work together. So the term length concern is an extremely undesirable call for it. there isn’t any incredibly passable interpretation of this capture 22 subject in physics. the main consumer-friendly referred to is the so referred to as Copenhagen Interpretation – this is incredibly a cop out interpretation that would incredibly only be shown to fail or have flaws in many situations.

Scientists use it b/c europe and almost everywhere else use it. Science is the whole world, so it would make sense if everybody is on the same page. It helps to advance more into science if everybody is using one measurement system.