Particle model of matter GapFill

The particle model of matter describes the different states of matter in terms of the particles that make them up. The least dense state of matter is  firegasenergysolid, which has particles spread far apart with no bonds between particles. The next least dense state of matter is  oilliquidwatergas, which has weak bonds between its particles, but these particles can still move past each other. The most dense state of matter is  solidmetalliquiddiamond, which has particles very close together with strong bonds between these particles.
Substances can change from one state of matter to another; for example:

• Melting is the state transition from  solid to liquidgas to liquidgas to solidliquid to solid.
• Sublimation is the state transition from  liquid to solidgas to liquidsolid to gassolid to liquid.
• Evaporation is the state transition from  liquid to solidgas to liquidliquid to gassolid to gas.

These state changes are  chemical changesmolecular changesatomic changesphysical changes, and they are reversible.

The internal energy of a system is the total  chemicalkinetic and potentialthermal and chemicalkinetic energy in the system, which can be increased by heating. This either increases the temperature of the system (which depends on the  insulationspecific heat capacitydensityspecific latent heat and mass of the objects in the system) or changes the state of the system (how much of the system changes state depends on the  densityspecific latent heatspecific heat capacityinsulation of the materials in the system). While an object changes state,  its temperature decreases and its internal energy decreasesits temperature and internal energy decreaseits temperature stays the same and its internal energy increasesits internal energy stays the same and its temperature increases.

Particles in a gas are in constant random motion. The temperature of a gas is related to  the average kinetic energythe sizethe chargethe specific latent heat of the particles in the gas. When the temperature of a gas in a fixed container increases, the pressure of the gas increases because  the particles explodethe particles hit the sides of the container at higher speedsthe particles begin to rotatethere are more particles.