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Matter Unit Vocabulary
Matter Unit Vocabulary
23
Science
7th Grade
04/06/2006

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Term
atom
Definition
the smallest particle of a given element
Term
Kinetic Theory of Matter
Definition
Particles of all matter are in constant motion
Term
Melting Point
Definition
The temperature at which a substance changes from a solid to a liquid
Term
Molecule
Definition
Two or more atoms combined to form this kind of particle
Term
Heat of fusion
Definition
The heat required to melt one kilogram of a solid at its melting point
Term
Surface tension
Definition
Water molecules at the surface pull themselves together
Term
Evaporation
Definition
The process by which individual particles of a liquid escape from the surface of a liquid that is not boiling and form a gas
Term
Crystalline solids
Definition
Solids that form with geometric patterns
Term
Condensation
Definition
The process by which particles move slowly enough for their attraction to bring them together to form a droplet of liquid
Term
Absolute Zero
Definition
The coldest temperature possible
Term
Freezing point
Definition
The temperature at which attractive forces begin to trap particles here and there, and crystals begin to form
Term
viscosity
Definition
A material's resistance to flow
Term
Matter
Definition
Anything that takes up space and has mass
Term
Non crystalline solid
Definition
Solids that form without creating a crystal structure
Term
Pressure
Definition
The amount of force applied per unit of area
Term
buoyancy
Definition
The decrease in weight caused by the upward force of displaced fluid
Term
State of matter
Definition
Tells you whether a material is a solid, liquid, or gas
Term
Heat of vaporization
Definition
The amount of energy required to change one kilogram of a liquid to a gas
Term
Density
Definition
The term referring to mass divided by volume
Term
Pascal's Principle
Definition
The term referring to the pressure applied at any point to a confined fluid being transmitted unchanged throughout the liquid
Term
Diffusion
Definition
The mixing of gas particles in the air
Term
Archimedes' principle
Definition
When an object is placed in a fluid, the object weighs less by an amount equal to the weight of the displaced fluid
Term
Boiling point
Definition
Temperature where some of a liquid begins to enter the gaseous state
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