How long is 3 mm and how long is 3 mm

Hello, cm.

The length of 3 mm is equal to centimeters For example, the length of rice is about 3 mm 3 grains of millet are arranged in a row, and the length is about 3 mm, using the different names of the units to guide students to further analyze, and then understand these different ideas for solving problems, which is of great help to improve students' ability to analyze problems.

Although the name of the unit is small, it still has a great effect. In teaching, we should not only guide students to write the name of the unit correctly, but also guide students to further understand the problem-solving ideas by observing the change of the name of the unit, so as to improve students' ability to analyze and solve problems. In order to distinguish each other, the family has different surnames.

For example, a pound or a kilogram is different.

In addition, there can be no unified measurement method for different things, in order to distinguish different kinds of different measurements, different units are used, for example, a pound of wine, two people, how do you distinguish between the numbers?

Hello: The length of 3 mm is equal to centimeters.

For example, the length of rice is about 3 mm.

3 grains of millet are lined up in a row, and the length is about 3 mm.

The length of 3 mm is equal to centimeters, and the reference is:1. The length of the rice is about 3 mm.

Millet grains are lined up in a row, and the length is about 3 mm.

A millimeter is the thickness of two of our usual toothpicks.

4. The steel ball in the bicycle flywheel is 3 mm.

5. The diameter of a round necklace is usually 3 mm.

3 mm is equivalent to the size of an apple seed.

The length of 3 millimeters is equal to centimeters, which is about the size of an apple seed, the size of a steel ball in a bicycle flywheel, and the length of a piece of rice.

Classification of length units:

1. Astronomical length search spine degree unit.

Light years, parsecs, astronomical units, lunar distances, earth diameters, teramins, light minutes, light seconds, and Beijing meters.

2. International Units.

The standard unit of length is the meter, which is denoted by the symbol m.

3. Other units of length.

Megameters (mm), kilometers (km), decimeters (dm), centimeters (cm), millidenier meters (mm), microns (m), nanometers (nm), etc.

4. Imperial units.

A few European and American countries use imperial units, mainly the United Kingdom and the United States, so they use different units of length, mainly miles, yards, feet, inches. <>

The length of 3 mm is equal to centimeters, which is about the same length as the ear of rice.

The reference of 3 mm is the length of 3 grains of millet in a row, the length of two toothpicks, the steel ball in the bicycle flywheel, and the diameter of a round necklace. The three-millimeter ruler is very small, it is very difficult to see with the naked eye, and three millimeters is centimeters, which should be like the body of a small ant. Three millimeters is about the length of three sesame seeds arranged together, and the diameter length of a mung bean.

Types of units of length:

The unit of length refers to the basic unit of measuring the distance in space, and it is the basic unit formulated by human beings in order to standardize the length. Its SI unit is the meter (symbol m), and the commonly used units are millimeters (mm), centimeters (cm), decimeters (dm), kilometers (km), meters (digging height m), microns (m), nanometers (nm) and so on. Units of length play an important role in various fields.

Geometric measurement, also known as length measurement, is a science that started relatively early, developed relatively fast and has relatively mature technology in China. China is a famous ancient civilization, with a glorious ancient civilization, measurement and testing technology is an important part of this civilization, and as a geometric measurement in metrology has a long history of development. As early as the Shang Dynasty, China began to have an ivory ruler, Qin Shi Huang unified the system of weights and measures, and there was a germ of interchangeability, which has been confirmed by the crossbow machine of the arrow family unearthed from the Terracotta Warriors and Horses, the eighth wonder of the world.

Around 1600 A.D., China began to develop length and timing measurement. The basic unit of length measurement, that is, geometric measurement, is the meter.

A unit of measurement is a measure chosen by people to measure a certain type of measurable size, and its value is determined by the definition of that unit. The physical standard that embodies the quantity given by the unit definition and has the highest accuracy is called the measurement benchmark of the unit. <>

3mm is equal to centimeters, and 2mm = centimeters and centimeters.

The analysis process is as follows:

Millimeter, also known as millimeter (or gong), is a unit of long-term grinding and leakage and rainfall, abbreviated as mm.

10 mm is equivalent to 1 centimeter, 100 mm is equivalent to 1 decimeter, and 1000 mm is equivalent to 1 meter (this is the literal meaning of milli).

About the advance rate of millimeters:

1 mm = cm; 1mm= 000μm=1 000 000nm。

Expand the information of the exhibition of blind paulownia

1. The basic unit of length The basic units of length are millimeters, centimeters, decimeters, meters, and kilometers.

2. Conversion between length units 1 km = 1000 meters, 1 meter = 10 decimeters, 1 decimeter = 10 centimeters, 1 centimeter = 10 millimeters.

1 mm = cm = decimeter = meter.

3. Tools for length measurement General measuring tools General measuring tools include measuring blocks, angle measuring blocks, multi-faceted prisms, positive search string gauges, calipers, micrometers, dial gauges (see dial gauges and dial gauges), multi-tooth indexing tables, comparators, laser length measuring instruments, tool microscopes, and coordinate measuring machines.

10 mm = 1 cm.

So: 3 mm = centimeters.