Give three characteristics of particles of matter.

Particles of matter are very small and invisible: The particles of matter are so tiny that they cannot be seen with naked eyes. They can only be seen under a powerful microscope.

Particles of matter have spaces between them: Even though particles of matter are very close to each other, there is still some space between them. This space between particles is what allows gases to be compressed or liquids to flow.

Particles of matter are constantly moving: The particles of matter are always in motion. The speed of their movement depends on their temperature. The higher the temperature, the faster they move. This is why substances expand when heated.