If you imagine one meter in real life it's a line. If you imagine 1meter*1 meter - which is a square meter- it's an areal/a surface. A cube meter is 1m*1m*1m - an actual physical cube with all sides being one meter. It's therefor called a cube number when a number 'a' is to the power of 3. Written a^3.
2.5^3 is a cube with all sides being 2.5 (of whatever unit you are using)
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