Micrometer — Science definition
A thousandth of a millimetre, written µm — the working unit for cells, which run from about 1 µm for a bacterium to 50 µm for a plant cell.
Where it is taught
- Measurements, Microscopes & Scale — Scientific Inquiry & Diversity of Life, Life Science & Scientific Inquiry, Grade 7
Questions using micrometer
Problem 1
A cell image is half the length of a 100-micrometer scale bar. What size is supported?
Answer and explanation
Its estimated length is 50 micrometers, assuming the bar belongs to that image and both are measured in the same direction.