I heard that rice can't be dried in the sun. What does it mean to put a pair of chopsticks on it if you really want to dry it?

Due to the extrusion between rice grains in the cup, the air in the cup is squeezed out, and the pressure outside the cup is greater than the pressure inside the cup. Rice grains and chopsticks stick together tightly, so chopsticks will lift the cup with rice.

Mi Yuanqi: 1792- 1799, led by French astronomers Tremble and Mishin, made a survey of the sky from Dunkirk, France to Barcelona, Spain.

1799, according to the measurement results, a short-section platinum rod of 3.5 mm× 25 mm was made, and the distance between the two ends of the rod was set as 1 m, which was kept by the French archives, so it was also called "archival meter". This is the earliest definition of rice, and this primitive rice utensil has been kept in the French archives in Paris.

Meridian definition:

Although the irregular surface of the earth is not a perfect sphere, France still uses this measurement result to determine the length of the standard meter.

Later, it was found that the length of the first archived meter was less than that defined by meridian 1/5 mm, because the oblateness of the earth and the arc length were miscalculated. But this length is still the standard. So in the end, the circumference of the earth passing through the pole is a little more than 40 million meters (40007863 meters).

1875 On May 20th, the French government came forward, held a meeting of government representatives from 20 countries, and formally signed the metric convention, recognizing the metric system as an internationally accepted unit of measurement. At the same time, it was decided to establish the International Metrology Committee and the International Bureau of Metrology. As of June 1985 and June 10, the metric convention has 47 members.