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3.2 Changes of State
Transcript of 3.2 Changes of State
Changes Between Solid and Liquid
Melting - changing from a solid to a liquid
Melting point - the specific temperature at which melting occurs. (0 degrees celcius for water) At the melting point, the particles of a solid move so fast that they break apart.
Freezing - changing from a liquid to a solid. Particles begin to move so slow that they begin to form regular patterns.
Changes Between Liquid and Gas
Vaporization - the change from a liquid to a gas. There are two types of vaporization.
Evaporation - only takes place on the surface of the liquid.
Boiling - takes place throughout the liquid.
Boiling point - the temperature at which a liquid boils. (Boiling point of water is 100 degrees celcius at sea level).
Boiling point will be lower with less air pressure (higher altitudes)
condensation - particles of a gas lose enough thermal energy to form a liquid. (ex. the mirror after a shower)
Changes Between Solid and Gas
sublimation - occurs when surface particles of a solid gain enough energy that they do not pass through the liquid state instead go straight to a gas.
Most common example of sublimation:
Homework: Write a proposal for your "Change of State Project". Describe your plan for your project in detail including your artistic medium, how you will represent the journey of the atom(s), who you plan to work with (if anyone), and any other pertinent information.