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  firegassolidenergy, which has particles spread far apart with no bonds between particles. The next least dense state of matter is  liquidgaswateroil, which has weak bonds between its particles, but these particles can still move past each other. The most dense state of matter is  metalliquiddiamondsolid, 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  gas to solidliquid to solidsolid to gassolid to liquid.
• Sublimation is the state transition from  gas to plasmasolid to liquidsolid to gasliquid to gas.
• Evaporation is the state transition from  liquid to gasgas to solidgas to liquidsolid to gas.

These state changes are  molecular changesatomic changeschemical changesphysical changes, and they are reversible.

The internal energy of a system is the total  thermal and chemicalkinetic and potentialchemicalkinetic energy in the system, which can be increased by heating. This either increases the temperature of the system (which depends on the  densityinsulationspecific latent heatspecific heat capacity 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  specific heat capacityspecific latent heatdensitythermal conductivity of the materials in the system). While an object changes state,  its temperature and internal energy increaseits temperature and internal energy stay the sameits internal energy stays the same and its temperature increasesits temperature stays the same and its internal energy increases.

Particles in a gas are in constant random motion. The temperature of a gas is related to  the specific latent heatthe specific heat capacitythe chargethe average kinetic energy 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 begin to rotatethe particles hit the sides of the container at higher speedsthere are more particles. When the pressure of a gas is increased, the temperature of the gas increases because  the particles repel each otherthere are more particleswork done on the gas increases its internal energythe particles do work on each other.