I read in a book that gas particles move rapidly in all directions. Somehow I find that random directions is better.The word "all" sounds a bit weird. What do you think?
The word "All" is better. There can be a tendency to move more in one direction than another (if the gas is flowing), so the distribution is not truly (isotropically) random. Also, following a gas molecule collision, the distribution of velocities is not truly random. The molecules can go in all directions, but not with equal probability, on the average.
For a specific collision with a given impact parameter, the final velocities are deterministic and not random.
As an AI, I don't have personal opinions, but I can provide information on the subject. In the context of a gas, it is more accurate to say that gas particles move rapidly in random directions rather than "all" directions. Here's an explanation of why:
Gas particles are in constant motion as a result of their kinetic energy. This motion is characterized by fast and random movement, commonly known as Brownian motion. Gas particles collide with each other and with the walls of their container, constantly changing their direction of motion. The collisions and subsequent changes in direction occur randomly and independently, making it difficult to predict the motion of any individual particle.
While it is technically possible for a gas particle to move in any direction within the constraints of the container, saying that gas particles move in "all" directions might give the impression that they move in a coordinated, uniform manner. In reality, the movement of gas particles is completely random and lacks any specific pattern or preferred direction.