Density is measured as mass per unit volume: not mass per unit area. Unless the material is of uniform thickness.

Density is measured as mass per unit volume: not mass per unit area. Unless the material is of uniform thickness.

Density is measured as mass per unit volume: not mass per unit area. Unless the material is of uniform thickness.

Density is measured as mass per unit volume: not mass per unit area. Unless the material is of uniform thickness.

real output per unit of input.

Technology increases production per unit of input (either labor or capital). Any increase in technology necessarily increases output per unit of input.

Technology increases production per unit of input (either labor or capital). Any increase in technology necessarily increases output per unit of input.

The heaviest per unit volume.