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We need to describe properties of materials:
- You cannot walk on water.
- If you knock a cup of coffee over what happens?
- If you pour a full kettle into a cup what happens?
- You can squeeze a sponge but not a brick.
Liquids (as can be seen from above) provide many interesting points.
It is useful to think of spaces occupied by objects. Thus we can define
properties such as:
- Capacity -- a bound to an amount of liquid.
- Amount -- volume occupied by a liquid.
- Full -- if amount equals capacity.
Other properties materials can posses include:
- Free -- if a space is not wholly contained inside another
- Surround -- if enclosed by a very thin free space.
- Particulate -- e.g. sand