Do molecules, subatomic particle and atoms travel in constant velocity?

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Isolated particles can travel at constant velocity only in a vacuum until they collide with another particle, as per Newton's First Law. However, even in a perfect vacuum, gravity would influence their motion, altering their velocity. In solids, particles vibrate with varying motion, while in liquids and gases, they constantly collide, changing speeds and directions. Therefore, molecules, subatomic particles, and atoms do not travel at constant velocity in typical conditions. The conclusion is that constant velocity is not achievable in most environments.
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The question is the title.
 
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Only isolated, individual particles (molecules, atoms, or individual particles) in a vacuum would travel at constant veloctiy, and then only until they hit another particle. And even if it were possible to fire a particle into a perfect vacuum, it would be influenced by gravity, and thus experience a force thereby changing its velocity.

Anthing in a solid will be vibrating with randomly varying amounts of motion. Particles in liquids and gasses will be constantly colliding with each other, and thus constantly changing speeds and directions.

Short answer: no.
 

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