Why K-K?

The word "Qian" means "Qian", so why does the abbreviation of "Qian" use K instead of T?

The story begins with the Greek word "chilioi" or "khilioi".

In Greek, these two words have a wide range of meanings, including "one thousand; ..... the meaning of "thousand".

When a group of French scientists were commissioned to make metric units, they shortened the Greek word "chilioi" to "kilo", so "k" became the abbreviation of "thousand".

Soon, people all over the world began to use K as the abbreviation of thousands.

Metric system is a completely innovative unit system, also known as the meter-kilogram-second (mks or MKS) unit system, which is based on the following three basic units: meter-definite distance, kilogram-definite quality, and second-definite time length.

It is based on scientific principles and meets the needs of increasingly frequent business activities and scientific research. Metric units appeared in the French Revolution.

One meter (m) is defined as 165076373 times of the orange light of krypton -86 spectrum in vacuum.

Second (s) time, one second is defined as the time for cesium atoms to swing 9 19263 1770 times.

The standard of mass unit (kg) is a piece of platinum-iridium alloy deposited in the International Bureau of Weights and Measures in Paris, which is the only basic unit for the definition of artificial products.

The temperature Kelvin (k) is defined as 1/273. 16 of the temperature of water at the triple point, and the temperature 0K is defined as absolute zero.

Mole is defined as the same basic number as the number of atoms contained in 0.012kg carbon atom.