Diameter or Length | Micrometers |
water molecule | 0.000385 |
polio virus | 0.03 |
HIV retrovirus | 0.1 |
herpes virus | 0.2 |
smallpox virus | 0.3 |
gonorrhea bacterium | 0.5 |
mimivirus | 0.8 |
anthrax bacterial spore | 1.0 |
Staphylococcus bacterium | 1.0 |
human cheek cell nucleus | 5.0 |
head of a human sperm | 5.0 |
puffball Spore | 5.0 |
human red blood cell | 7.5 |
snow algae aplanospore | 30 |
phytolith of crab grass | 32 |
lichen spore (length) | 35 |
60 | |
fine human hair (width) | 70 |
smallest orchid seed | 85 |
coral-root orchid seed | 200 |
Wolffia angusta fruit | 300 |
Amoeba cell | 300 |
grain of table salt (NaCl) | 300 |
onionskin cell | 400 |
Wolffia angusta plant | 600 |
diameter of pin head | 1500 |
nerve cell (spinal cord) | 600,000 |
Eucalyptus regnans | 100,000,000 |
planet earth (diameter) | 1.3 x 1013 |