Can be observed and measured without changing the kind of matter being studied.

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Presentation transcript:

Can be observed and measured without changing the kind of matter being studied.

 The temperature at which a solid can be changed to a liquid.  The temperature at which a pure substance melts is unchanging under constant conditions.  Example: Ice melts to form a liquid water at 0 degrees Celsius.

 The temperature at which a liquid boils.  Substance changes from a liquid to a gas.  Boiling begins when the liquid starts to form bubbles throughout, which grow larger, rise to the surface and burst.  Temperature remains constant as long as the water is boiling.  Boiling point for pure water at sea level is 100 degrees Celsius.

 Relationship between the mass of a material and its volume.  Substances that are denser contain more matter in a given volume.  Will stay the same no matter how large or small the sample of the substance.  Examples: Lead is very heavy, dense Aluminum is very light

 By itself, color is not a significant identifier of a substance.  Absence of color is also a physical property.