Particle model of matter

• density= mass/volume
• solid

  • regularly packed
  • vibrate around a fixed position
  • high density
• liquid

  • randomly arranged
  • medium density
  • move around eachother
• gas

  • low density
  • randomly arranged
  • moves quickly in all directions
• compressed

  •  decreases the volume which increases the pressure
• expanded

  • increases the volume which decreases the pressure
• specific heat capacity

  • the energy needed to raise temperature of 1kg of a substance by 1c
• specific latent heat

  • energy needed to change the state of 1kg of a substance without changing the temperature
• what happens the higher the altitude?

  • air gets less dense
  • pressure decreases
  • the colder the temperature less collision
• upthrust

  • higher pressure on the bottom surface of the object
  • if the weight force is greater than the upthrust it will sink
• why do you things float?

  • if you are less dense or the same density than the liquid you float
• what happens when you do work on gas?

  • it increases the kinetic energy and temperature
• random errors

  • changes depending on each measure
  • take multiple readings and calculate the mean
• zero error

  • is a type of systermatic error
• uncertainty

  • range/2