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Matter
Anything that has mass and occupies space.
States of Matter
The physical forms in which matter can exist: solid, liquid, and gas.
Solid
A state of matter with a definite shape and volume; particles are closely packed together.
Liquid
A state of matter with a definite volume but no definite shape; particles are close but can move past each other.
Gas
A state of matter without a definite shape or volume; particles are far apart and move freely.
Melting
The process by which a solid turns into a liquid.
Freezing
The process by which a liquid turns into a solid.
Evaporation
The process by which a liquid turns into a gas.
Condensation
The process by which a gas turns into a liquid.
Sublimation
The process by which a solid turns into a gas without passing through the liquid stage.
Deposition
The process by which a gas turns into a solid without passing through the liquid stage.
Physical Change
A change that affects one or more physical properties of a substance without changing its chemical composition.
Chemical Change
A change that occurs when one or more substances change into entirely new substances with different properties.
Boiling Point
The temperature at which a liquid turns into vapor.
Freezing Point
The temperature at which a liquid turns into a solid.
Non-Reversible Change
A change that cannot be undone, resulting in the formation of new substances.
Reversible Change
A change that can be reversed to get back the original substance.
Flammability
The ability of a substance to catch fire.
Reactivity
The tendency of a substance to undergo a chemical reaction.
Toxicity
How poisonous a substance is.
Condensation
The process by which water vapor turns back into liquid water.
Humidity
The amount of moisture in the air.
Density
The mass per unit volume of a substance.
