It is a tool for measuring length, and the "centimeter" on the ruler is a unified unit of length. Centimeter is a small unit of length, which can be used as a unit of smaller objects. Centimeters are denoted by "cm",
When measuring the length of an object, we must use a unified standard to measure it, so that we can know how long the object is. You can measure it with a ruler. When measuring an object in centimeters, aim the scale 0 of the ruler at the left end of the object, and then see how many centimeters the right end of the object faces.
Second, rice.
In terms of length, it can exceed centimeters. It has many friends, one of whom is Mi.
When measuring long objects, the unit is usually "meter", which can be expressed by "meter".
1 m = 100 cm, on the contrary, 100 cm = 1 m, and the forward speed between them is 100.
When comparing or adding or subtracting between meters and centimeters, we should first unify the units, convert meters into centimeters or centimeters into meters, and then compare them.
Three, meters and centimeters are units of length, meters are the basic units of length in the international system of units, the symbol is m, centimeters are not international units, but common units, and the English symbol is cm. A centimeter is one hundredth of a meter, 1 m = 100 cm, 1 cm =0.0 1 m.
The unit of length is the basic unit formulated by human beings to standardize the length. Commonly used units are millimeter (mm), centimeter (cm), decimeter (dm), kilometer (km), meter (m), micron (micron), nanometer (nm) and so on. In the international system of units, the standard unit of length is "meter", which is represented by the symbol "m".
Fourth, the origin of meters, centimeters are only units set for conversion. The word rice originated earlier. It has been nearly 200 years since the French National Assembly adopted the establishment of the measurement unit based on the length unit "meter" in 179 1 year. Metric units are decimal, with special prefixes to form multiple units and decimal units of the main unit. Basic units have scientific benchmarks and can be copied with high accuracy. Because of these advantages, it is gradually accepted by other countries. But with the development of science and technology, the metric system has derived various units, such as centimeter, gram, second system, meter, kilogram, second system and so on. In this way, the metric system is no longer a single unit system, and there are some units with special names, which lack scientific connection and contradict each other.
The international system of units was born in 1960, which originated from the metric system and inherited its advantages (such as decimal, decimal multiples and decimal units composed of special prefixes, etc.). ), and overcome the shortcomings of the metric system (such as the coexistence of multiple units), is a modern form of the metric system. The International System of Units (SI) takes seven units: meter, kilogram, second, ampere, kelvin, Candeira and mole, and the prefix is extended from 10- 18 to10/8. At the same time, several widely used units other than SI are retained to meet the needs of various disciplines, which is more scientific than the metric system.