Question

what is si unit ??? And what are prefixes

Answer 1

A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or fraction of the unit. While all metric prefixes in common use today are decadic, historically there have been a number of binary metric prefixes as well.[1] Each prefix has a unique symbol that is prepended to the unit symbol. The prefix kilo-, for example, may be added to gram to indicate multiplication by one thousand: one kilogram is equal to one thousand grams. The prefix milli-, likewise, may be added to metre to indicate division by one thousand; one millimetre is equal to one thousandth of a metre.

Answer 2

Answer:

Explanation: SI unit is an international units which is used for whole phisics

and there are 7 fundamental quantities for that

lenght

mass

time

current

amout of substance

temparature

candla