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This animation illustrates the negative powers of ten. Starting with one meter, we delve successively into matter until we reach objects in the range of a nanometer.

A correspondence between exponential notation and units of measurement (millimeter, micrometer, nanometer, angstrom) is demonstrated.

**Click **on the central frame or on the scale at top to progress through the zooming process.

- To illustrate the structure of living cells and orders of magnitude.
- To introduce the problem of units and orders of magnitude.
- To define the powers of ten (in this case, the negative ones)
- To define the terms decimeter, millimeter, micron or micrometer, nanometer and angstrom.

Most of us have problems dealing with very large or very small numbers.

Historically, this difficulty originated at the time and place of the French Revolution, in 1789. In effect, common sense…