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All particles of all things are in constant motion. Particles in a liquid collide, but the rate is subdued by the viscosity of the liquid.
The substance's state (solid / liquid / gas), density, temperature, etc, is determined by motion and spacing of particles.
That would be Brownian motion. That refers to small particles (for example, dust particles) suspended in a liquid or gas exhibiting random behavior - this is caused by liquid or gas molecules bumping into the dust particle.
Forces of attraction limit the motion of particles most in a solid. A solid that forms and separates from a liquid mixture is a precipitate.
In the gaseous state. Gas particles have the highest kinetic energy compared to liquid and solid particles.
Yes, pressure in the liquid caused by its molecules constantly being in motion force it to take on the shape of its container (within limits).
random -- the particles go about in a random fashion in a liquid -- cannot predict which direction a molecule of the liquid will hit the particle in the next period of time of significance (seconds or minutes).
This transfer of heat is called convection.
Brownian motion
The force of atttraction among them limit their motion
the forces of attraction among them limit their motion.