The problem of doubling mathematical units actually involves the concepts of mathematics and physics. In mathematics, multiples are defined by multiplication, that is, one number multiplied by another. For example, 2 is twice as much as 1 because 2× 1=2.
But in physics, in order to describe actual phenomena and processes, we sometimes need to use units with practical significance. For example, units such as length, weight and time are all defined to describe the actual phenomena we can perceive.
Some of these units are compound units, such as "meter/second" or "Newton/meter", which are actually the quotient or product of two or more basic units. These composite units cannot be simply doubled, because the actual physical phenomena or processes they represent cannot be simply doubled. For example, you can't double the speed unit of "m/s" to get an acceleration unit of "m/s 2", because acceleration is the rate of change of speed, not simply doubling the speed.
In addition, some units are basic units, such as meters (length), kilograms (mass), seconds (time) and so on. These basic units can be used to describe basic physical phenomena, and they can be converted by simple multiplication or division. For example, the unit of speed is meters per second, which can be composed of the basic units of meters and seconds, that is, speed = distance/time.
In a word, the answer to the problem of doubling mathematical units lies in the difference between practical units used in physics and abstract units used in mathematics. In physics, the units that describe actual phenomena are usually compound units or basic units that cannot be simply doubled, while in mathematics, multiples are defined by multiplication.
fundamental unit
The basic unit refers to a social and economic unit that has a certain activity place and engages in certain production activities in China except the family. Including enterprises, institutions, organs, social organizations and other legal persons approved by legal procedures. These units have certain activity places and engage in certain production activities. They are the cells and carriers of economic and social activities and the most basic units in the government's macro-control system.