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Particles in Motion

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  • In __________ particles are held together not as tightly.
    Liquids
  • In _______ the particles are held tightly together.
    Solids
  • What do solid particles do when they move?
    Vibrate
  • When a liquid is heated up, what changes: volume, mass, or both?
    Volume
  • Why do hot-air balloons fly in the early morning or late afternoon?
    The air is less dense
  • What happens to liquid when it is warmed?
    It expands
  • When temperature increases, what else increases?
    Kinetic Energy
  • When heat energy heats up water and causes it to bubble, what is happening?
    The water is boiling
  • What is the study of heat called?
    Thermodynamics
  • What are the 3 states of matter?
    Solid, liquid, gas
  • What is diffusion
    When two things mix to become one
  • When something is heated up, and the particles gain energy and move apart, the volume increases. What happens to the mass?
    It stays the same
  • What is random motion?
    When particles move in every direction at different speeds
  • What is it called when energy is being stored?
    Potential energy
  • What is thermal contraction?
    When heat energy decreases, the particles slow down and take up less space
  • What is Thermal Expansion?
    When heat energy increases, the particles move faster bumping into each other and pushing farther away taking up more space
  • What is temperature?
    The measure of the average kinetic energy of the particles in a material
  • What is the energy of motion called?
    Kinetic Energy
  • In _________ particles are hardly held together at all.
    Gas
  • If metal bars are heated up to determine how their volume and length would be affected, what is the outcome?
    Both the volume and length would change
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