Why can Poisson's ratio be negative,

When a substance in solid state has tensile (or compressive) deformation and elongation L in one direction, it will decrease (or increase) in the direction perpendicular to it

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1. What is the physical meaning of Poisson's ratio?
2. What does Poisson's ratio of material mean?
3. In quantum mechanics, what does the commutation and non commutation between operators representing mechanical quantities mean? What is their physical meaning?
4. The physical meaning of m in mechanics
5. In the international system of units, the basic unit of mechanical quantity is (). The unit of force is (), which is derived from the formula () There is no need to answer the unit of force
6. Given four points a (1,0) B (4,3) C (2,4) d (0,2) on the rectangular coordinate plane, this paper proves that the quadrilateral ABCD is isosceles trapezoid
7. Given four points a (- 1,3), B (1,1), C (4,4) d (3,5), this paper proves that the quadrilateral ABCD is a trapezoid, using sine and cosine theorem~
8. Are the edges of parallelogram ABCD ad = 2Ab, AE = BF = AB, EC intersecting ad at m, FD intersecting BC at n, and quadrilateral CDMN diamond? Explain the reason emergency
9. How to play the multiplication and division method of abacus? Don't give me a pithy formula. It's better to give an example of how to calculate 25x25. If it's three digit
10. Material is that abacus, Baidu can take a look Material 2 is that after five years of efforts, Chinese abacus project has been listed in the list of human intangible cultural assets of UNESCO. (1) combined with material 1, using the knowledge of cultural heritage, this paper analyzes the Enlightenment from the development of Chinese abacus (2) From From the perspective of cultural assets, talk about your understanding of China's abacus application for world heritage
11. Flying man in the air, when one person and then another person's hand swing to the highest point (the lower body is still perpendicular to the horizontal plane), the lower part of the lower person from the ground is marked as o point. At this time, the two people let go and asked, does that person fall at o point, or to the right or left of o point? PS: now there are two kinds of disputes, one is on the o point, the other is on the left side of o point. Please express your opinions and explain the reasons!
12. If the physics textbook is placed on the horizontal table and the pencil case is placed on the physics textbook, then () A. The gravity of physics textbook and the supporting force of desktop on physics textbook are a pair of balance forces. B. the pressure of physics textbook on desktop and the supporting force of desktop on physics textbook are a pair of interaction forces. C. the supporting force of physics textbook on stationery box and the pressure of stationery box on Physics Textbook are a pair of balance forces. D The support of the desk to the physics textbook and the pressure of the pencil case to the physics textbook are a pair of interaction forces
13. What is the physical meaning of Junior High School Physics G
14. The physical meaning of G = g / M Like the gravity per kilogram?
15. What is the definition of mechanics?
16. English translation Delete the newly applied load on the modified beam,and use the the pin support tool to put the right support back again.Now replace the left fixed support with a pin support tool.
17. English translation In which countries is the game sold Tea is grown in the south of China The article in the newspaper refers to the local government What's going to happen when I'm through all the barriers The dance club is well organized
18. English translation The capital of Berlin,as the seat of the Allied Control Council,was similarly subdivided into four sectors despite the city's location deep inside the Soviet zone
19. English translation She smoothed her down with a wet comb,wiped her muddy shoes,and thought about the three months she had known him.
20. English translation Although the 532 nm (green) wavelength has the lowest absorption in water,generating the 532 nm (green) or 355 nm (ultraviolet) wavelengths with harmonic single crystals from 1064 nm laser pulses reduces the laser pulse energy output by a factor of two or more due to the conversion process and to associated inefficiencies.