How the 1 meter was determined, and how the 1 meter came about in the first place

Your question is not very detailed, I don't know what you're asking, rice has many meanings, and I suggest you be more detailed.

A meter of sunshine?? It's up to you to decide what you want.

The definition of "rice" originated in France. The length of 1 meter was originally defined as one ten-thousandth of the distance from the Earth's equator to the North Pole on the meridian through Paris, and was subsequently identified with the International Meter Prototype. This unit was called mètre, which later evolved into meter, which translates to "米tu" or "米" in Chinese.

In 1791, the plan was approved by the French Parliament. On December 10, 1799, France adopted the metric system and began to officially use the metric system.

On May 20, 1875, France** came forward to convene a meeting of representatives of 20 countries**, and formally signed the Metric Convention, which recognized the metric system as the internationally accepted unit of measurement. At the same time, it was decided to establish the International Committee for Weights and Measures and the International Bureau of Weights and Measures. As of October 1985, there were 47 member states to the Metric Convention.

China joined in 1977.

In 1983, the International Congress of Weights and Measures redefined the meter: "the distance of light traveling 1 299792458 seconds in a vacuum" is one standard meter.

Meridian definition.

Although the Earth's irregular surface is not perfectly spherical, France adopted the results of this measurement to determine the length of the standard meter. It was later discovered that the length of the arc was miscalculated due to the miscalculation of the flattening rate of the earth, and that the length of the first archival meter prototype was 1 5 mm less than the meter defined by the meridian. But this length is still considered as the standard.

As a result, the circumference of the Earth through the poles is a little more than 40 million meters (40,007,863 meters).

On May 20, 1875, France** came forward to convene a meeting of representatives of 20 countries**, and formally signed the Metric Convention, which recognized the metric system as the internationally accepted unit of measurement. At the same time, it was decided to establish the International Committee for Weights and Measures and the International Bureau of Weights and Measures. As of October 1985, there were 47 member states to the Metric Convention.

One quarter of a ten-thousandth of the meridian of the earth through Paris.

Addendum: Later, people made a rice prototype and defined its length as one meter.

International Rice Original.

In 1889, the First International Conference on Weights and Measures established the "meter prototype" as the international length standard, which stipulates that 1 meter is the distance between the two inscription lines at the two ends of the meter prototype at 0 degrees Celsius. The accuracy of the meter prototype can reach microns, that is, ten-millionths of a meter, which can be said to be accurate enough. However, at the 11th International Conference on Weights and Measures held in 1960, delegates unanimously passed a resolution to abolish the rice harature, arguing that it was neither convenient nor accurate.

The 11th International Conference on Weights and Measures abolished the old "meter" standard and also stipulated a new "meter" standard, which is the wavelength of orange-yellow light emitted by the Krypton-86 isotope lamp in a vacuum under specified conditions.

It is convenient and accurate to use light as a ruler, and with Krypton 86 as a ruler, the accuracy can reach microns, which is about 1/100,000th of the diameter of a hair. Krypton lamps can be manufactured all over the world, and there is no need to go to the International Bureau of Weights and Measures to check the meter ruler.

After the advent of lasers, krypton lamps were much inferior. Using the wavelength of the laser as a ruler, theoretically it can be 1 million times more accurate than a Krypton-86 isotope lamp. In 1969, a laser was used to measure the distance between the Earth and the Moon, which was more than 380,000 kilometers long, with an error of only a few meters.

The laser is a good ruler for going to the sky and the sea, and it is handy, delicate and accurate to use. Therefore, in October 1983, the United Nations Metrology Organization held a meeting in Paris and formulated a new definition of "meter", that is, the distance traveled by light in a vacuum 299792458 a second is set as a standard meter. In recent years, various laser encoders have been introduced, such as laser length meter, laser binary coordinate meter and so on.

One meter is equal to ten centimeters, one decimeter is equal to ten centimeters, and one centimeter is equal to ten millimeters.

1m=10dm, 1dm=10cm, 1cm=10mm

(1) m

The "meter" (metre), the unit of length of the International System of Units, originated in France. In May 1790, a special committee of French scientists recommended that the length of the earth's meridian passing through Paris be 1/40 millionth of the length of the meter, which was approved by the French parliament in 1791.

In order to create a reference device to characterize the value of the meter, measurements were made in 1792 1799 from Dunkirk, France, to Barcelona, Spain, under the leadership of French astronomers Gerionum and Mishen.

In 1799, a platinum metre bar with a short section of 25 mm was made according to the measurement results, and the distance between the two ends of the pole was set at 1 meter, and it was handed over to the French archives for safekeeping, so it is also called "archive meter". This is the earliest definition of a meter.

(2) Decimeters

The decimeter (or dm) is one of the metric units of length, and 1 decimeter is equivalent to one-tenth of a meter. The common conversion relationship is as follows: 1 decimeter = kilometer (km) = meter (m) = 10 centimeter (cm) = 100 millimeters (mm).

(3) cm

centimeters, units of length; English: centimetre(s), abbreviated (symbol) is: cm. The unit conversion for centimeters is as follows: 1 centimeter = 10 millimeters = decimeters = meters = kilometers.

(4) mm

The millimeter, also known as the metric (or gong), is a unit of length and a unit of rainfall, symbol. 1 millimeter is equivalent to 1/1000th of a meter (this is the literal meaning of milli). The base system relationship is as follows: 1 mm = cm = decimeter = meter = kilometer.

Generally so, it's not good, it's not bad, you can give about seventy points.

One meter: In 1983 it was defined as the distance traveled by light in a vacuum for 1 299792458 s (seconds), symbol m.

1. One meter. A commonly used unit of length. The unit of length in the International System of Units is one of the seven basic units.

2. Advance rate. 1 km = 1000 m.

1 meter = 10 decimeters.

1 meter = 100 centimeters.

1 m = 1000 mm.

1 m = 1,000,000 microns.

1 meter = 1000000000 nanometers.

Corresponding area unit: square meters.

Corresponding volume unit: cubic meters.

The definition of "rice" originated in France. The length of 1 meter was originally defined as one ten-thousandth of the distance from the Earth's equator to the North Pole on the meridian through Paris. From 1983 to the present, the length of a meter has been defined as "the distance traveled by light in a vacuum in 1 299792458 second."

1 meter is defined as the distance that light travels in a vacuum for 1 299792458 seconds.

Summary. Hello, it is a pleasure to help you with your studies. One meter is one meter, of course, this is the case. This is considered using rounding to count.

One meter one, counted as one meter, is there any?

Hello, it is a pleasure to help you with your studies. One meter of foot is counted as one meter, and of course the Ling Chao is wide and annihilated. This is considered using rounding to count.

Because the decimal point is a number less than five, rounding can be omitted to be about one meter.

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Decimal point.