To illustrate that a solid object need not have a distinct inside and outside. This has important implications for topology.
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I think a plate
Well that would depend on the size of the plastic bottle. If the bottle is large use litters or "L" for short. If the bottle is small use milliliters or "ml" for short.
To remove a solid material from a regent bottle one should use
in math
We learned about area and perimeter in math class.