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