Studied by 3 peopleParticle
One of the very small parts of matter.
Kinetic theory
The theory that all matter consists of tiny particles (atoms, ions, molecules) that are moving constantly- they never stop.
Collision
An instant of one moving object striking violently against another.
Elastic collision
When objects collide to each other and they are able to resume their normal shapes spontaneously, after contraction.
Gas pressure
The force exerted by a gas on a surface.
Vacuum
An empty space with no atoms or molecules in it, so it has no pressure.
Atmospheric pressure
All the air that surrounds the Earth to a height about 12km.
Kinetic energy
The (movement) energy an object has due to its motion.
State of matter
____ is also called as phases, which includes: solid, liquid, gas and plasma (rare).
Barometer
A device that measures air pressure and shows when the weather is likely to change
Vapor
A gas that forms above a liquid surface due to the evaporation of liquid particles.
Evaporate
A form of vaporization occurs at lower temperature, where only a small proportion of particles near the surface have enough energy to enter the gas phase.
Vaporize
The conversion of a liquid into a gas.
Boil
A form of vaporization occurs when the temperature is high enough that particles throughout the liquid have enough kinetic energy to enter the gas phase.
Condense
The conversion of a gas into a liquid.
Vapor pressure
The force exerted by a gas (vapor) above a liquid surface due to particle collision.
Dynamic equilibrium
A situation in which two opposite chemical reactions happen at the same speed (rate of evaporation = rate of condensation).
Note 
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