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Physical Science

TermDefinition
Matter Material that takes up space and has mass
Mass The amount of matter in an object
Volume The size of an object
Law of the Conservation of Matter Scientific law that states that matter cannot be created nor destroyed but can change states
Physical Change A process that does not change the chemical make-up in a substance. Ex. Breaking your pencil
Chemical Change A process that involves a change in the chemical makeup of the substance. After the change, it no longer has the same properties. Ex. Frying an egg
Solid Has a definite size (volume) and shape; particles are packed together tightly and movement is not fast
Liquid Has a definite size (volume) but no definite shape; particles are more active and farther apart than in a solid
Gas Has no definite size or shape; particles are far apart and move very fast
Plasma The basic state of matter on the sun's surface
Condensation A change from a gaseous to a liquid state, caused by a decrease in temperature
Evaporation A change from a liquid to a gaseous state, caused when a liquid is heated to its boiling point
Freezing A change from a liquid to a solid state, caused when a substance reaches the freezing point
Melting A change from a solid to a liquid state, caused by an increase in temperature to the melting point of the substance