12 terms

IGCSE Physics: Solids, liquids and gases

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Density
The mass per unit of volume of a substance.
Pressure
The force per unit of area of a substance.
Boiling
The change of state from liquid to gas.
Condensing
The change of state from gas to liquid.
Freezing
The change of state from liquid to solid.
Melting
The change of state from solid to liquid.
Solid
The state of matter in which molecules are tightly packed and held in fixed positions by strong forces.
Liquid
The state of matter in which molecules are closely packed but do not have a regular structure.
Gas
The state of matter in which molecules are widely spaced and in a continuous state of random motion.
Brownian motion
Atoms, molecules, and particles are always moving in random directions; randomly moving particles that hit each other move in opposite directions.
Boyle's Law
A principle that shows that volume is inversely proportional to pressure for a fixed amount of gas at a constant temperature.
Absolute zero
The coldest temperature, 0 Kelvin, or -273°C, that can be reached. It is the hypothetical temperature at which all molecular motion stops.