c = 2.99792458 x每秒108米
e = 1.602177 x 10-19 C.
引力常数是由艾萨克·牛顿爵士开发的重力定律的一部分。 引力常数的测量是由入门物理学生通过测量两个物体之间的引力吸引力进行的常见实验。G = 6.67259×10-11 N m2 / kg2
Physics is described in the language of mathematics, and the equations of this language make use of a wide array of physical constants. In a very real sense, the values of these physical constants define our reality. A universe in which they were different would be radically altered from the one that we actually inhabit. The constants are generally arrived at by observation, either directly (as when one measures the charge of an electron or the speed of light) or by describing a relationship that is measurable and then deriving the value of the constant (as in the case of the gravitational constant). This listing is of significant physical constants, along with some commentary on when they are used, is not at all exhaustive, but should be helpful in trying to understand how to think about these physical concepts. It should also be noted that these constants are all sometimes written in different units, so if you find another value that isn’t exactly the same as this one, it may be that it has been converted into another set of units Even before Albert Einstein came along, physicist James Clerk Maxwell had described the speed of light in free space in his famous Maxwell’s equations describing electromagnetic fields. As Albert Einstein developed his theory of relativity, the speed of light took on relevance as a constant underlying important elements of the physical structure of reality.
c = 2.99792458 x 108 meters per second
Charge of Electron
Our modern world runs on electricity, and the electrical charge of an electron is the most fundamental unit when talking about the behavior of electricity or electromagnetism.
e = 1.602177 x 10-19 C
The gravitational constant was developed as part of the law of gravity developed by Sir Isaac Newton. The measurement of the gravitational constant is a common experiment conducted by introductory physics students, by measuring the gravitational attraction between two objects.
G = 6.67259 x 10-11 N m2/kg2