Science
How many nanometers thick is a single human hair?
80,000 to 100,000
Background
A single human hair is about 80,000 to 100,000 nanometers thick. That sounds like a lot, but it is only around one tenth of a millimeter. Many viruses are more than 1,000 times smaller than one hair. Under a microscope a hair looks like a huge tree trunk.
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