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How Big is a ... ?

The head of a pin is about 2mm in diameter. Use this animation to compare the relative sizes of cells and organisms sitting on a pinhead. Nearly invisible without magnification, dust mites dwarf pollen grains and human cells. In turn, bacteria and viruses are even smaller.

Download this animation and its matching PowerPoint® ($).

 

How to use:

  • Use the left and right arrows to change magnification.
  • Click on the magnifications (1, 10, 100...) for a "Power of Ten" zoom.
  • Choose an individual cell or organism (right) to bring it into view.
  • Use the scale to measure individual cells.

 

1 millimeter = 0.001 meter
1 micron = 0.000001 meter
1 nanometer = 0.000000001 meter

 

Some Keywords:

metric system, micron, angstrom, virus, bacteria, nanotechnology

 

 

 

 

 

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