1. Introduction of terms Density
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Introduction of terms
Density

2. A. Terms
Observation – interaction with the environment - use your 5 senses
Inference – a guess based on observations
Law of uniformitarianism – the present is the key to the past

3. Prediction – a guess (inference) about the future
Cyclic – occurs in a pattern, over and over - easy to predict - example: phases of the moon
Non-cyclic – occurs randomly - difficult to predict - example: earthquake

4. B. Density Density is a physical property
can be used to identify a substance
does not change if material is broken into pieces
Density = mass / volume
Most objects are most dense as a solid
Water is the exception
Water expands when it freezes
Solid water – ICE - floats
Water is most dense (1 g/mL) as a liquid at 3.98°C

5. Temperature Pressure As temperature increases, density decreases
Warm air rises because it is less dense
Pressure
As pressure increases, density increases