Yes, it is true.
It basically states that all matter is made up of tiny moving particles.
To demonstrate this, you could heat water (heating it allows the particles to move faster) and you will see as it boils bubbles on the top, showing that particles are constantly moving however in this case you have sped them up.
thwe awnser is plasma
Yes. All atomic sized particles move, by vibrating. no matter how cold they are.
yes. gas has the fastest moving particles and a solid has the slowest moving particles and particles in a liquid are moving faster than solid particles but not as fast as gas particles.
One pretty clear indication of this is the Brownian motion.
Gasses will have the fastest moving particles, Liquids will have moderately moving particles, and Solids will have the slowest moving particles.
north to south
lightspeed
solid
ing particles, Liquids will have moderately moving particles, and Solids will have the slowest moving
ing particles, Liquids will have moderately moving particles, and Solids will have the slowest moving
ing particles, Liquids will have moderately moving particles, and Solids will have the slowest moving
ing particles, Liquids will have moderately moving particles, and Solids will have the slowest moving
Kinetic energy.
solid
Moving particles