(1) There are differences between solids and liquids

(2) Air has weight and is all around us

(3) Solid materials have air in the "gaps"

(4) Soils have air trapped in them

(5) There are many gases and many of these are important to us

(6) Gases have weight

(7) Gases are formed when liquids evaporate

(8) Gases flow easily

Learning Objectives (Skills): Gases

(1) Ask scientific questions

(2) Use evidence to explain

(3) Know how and why to take repeat readings

(4) Measure volume of water accurately. Decide how impt it is to take repeat readings. Explain how we know that some soils have more air in them than others.

(5) Decide how to answer a question. Set up a fair test. Identify how much to trust results.