Changing States of matter (1)

What is Changing State of Matter?

A change of state is a physical change in a matter.

Matter changes state when energy is added or taken away. Matter changes because of heat energy or pressure.

Boiling point is a temperature at which a pure liquid changes into a gas. (100^oC)

Melting point is a temperature at which pure liquid changes into solid. (0^oC)

Kind of changing states of matter

1.    Evaporation = liquid to gas. Example = boiling water

2.     Condensation = gas to liquid. Example = dew.

3.    Freezing = liquid to solid. Example = ice cube production

4.    Melting = solid to liquid. Example = melting ice cream

5.    Sublimation = solid to gas. Example = mothball, dry ice

6.    Deposition = gas to solid. Example = snow

Exercise

1. Examine changing state of water cycle!

2. What is technology which implement concept of changing state of mater?

3. Why does water that is heated continuously run out?