1. R in mathematics

The ?R? in number theory represents the set of real numbers in set theory, and the real number part of the complex numbers is also represented by this symbol.

The geometric R? or ?r? represents the radius of a circle.

In geometry, ∠R represents a right angle.

In geometry, a right triangle can be expressed as Rt△, and "Rt" comes from the first two letters of right-angle in English.

2. R in physics

In physics and electromagnetism, the italic ?R? represents resistance, and the upright R represents the live wire.

The thermodynamic R represents three temperature scales: °Ra represents the Rankine temperature scale, °Re represents the Reaumur temperature scale, and °Rø represents the Rømer temperature scale. fdgf position means the amount of rotation per unit time (number of turns, degrees, radians).

3. R in chemistry

R in organic chemistry is the general name for hydrocarbon chains .

R in stereochemistry represents the right-handed (clockwise) molecular arrangement around a carbon atom, and the determination method is based on Cahn Ingold Prelog priority rules

Biochemistry. R represents arginine.

The r? of chemical reaction represents the molar production rate per unit volume.

4. R in medicine

R in medicine refers to the respiratory rate of a person. For example: R of a normal person is 16 to 20 times/min.

5. R in the computer

R in the computer. For an editing language for statistics, please see the R language.

6. R in Architecture

R in Architecture is a non-metric unit of measurement for thermal resistance.

7. R in Japanese

When converting Japanese text into Roman pinyin, choose R to represent the consonant of the kana "ら" line (line 9) instead of L.