what are the advantages of using international systems (si)
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The first advantage is that its value is understood world-wide (unlike say the pint - the British pint is larger than the American pint).
The second advantage is that its multiples and sub-multiples are consistent and are powers of 10 - unlike the relationship between say inches, feet, yards, chains, furlongs and miles where the relationships are 12, 3, 22, 10 and 8.
The third advantage is that when it is used in engineering calculations to calculate some other SI quantity, the constant used is usually 1 - for example one watt is the power needed to move one kilogram as a velocity of one metre per second against a force of one newton, whereas one horsepower is the power needed to moved 550 pounds at a speed of one foot per second against gravity. (This is called coherence of understand