Microscope images of mask fabrics (IMAGE)

National Institute of Standards and Technology (NIST)

Microscope images of mask fabrics

Caption

Scanning electron microscope images of cotton flannel (left) and polyester (right). Cotton fibers absorb moisture from breath, which increases filtration. Each segment of the image scale bars is 50 micrometers, or millionths of a meter -- roughly the width of a human hair.

Credit

Credit: E.P. Vicenzi/Smithsonian's Museum Conservation Institute and NIST

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