Final answer:
Gas particles primarily exhibit random translational motion. They move in straight lines until they collide with other particles or container walls, and can also show rotational and vibrational motions.
Step-by-step explanation:
Gas particles move in random translational motion. These particles are constantly in continuous motion, traveling in straight lines and only changing direction when colliding with other molecules or container walls. The movement is such that there is no predictable pattern, hence the term 'random', and since the particles travel in lines until collisions cause a change in direction, it is referred to as 'translational'. In addition to translational motion, gas particles can also exhibit rotational motion and vibrational motion, although the latter is more pronounced in liquids and solids. In the context of gases, the most significant motion is the translational kinetic energy, which is related to the temperature of the gas.