video: This video, created using a schlieren imaging system, shows air flow when breathing and coughing, with and without a face mask. It does not show the movement of virus particles. This video was created by Matt Staymates, a research engineer at the National Institute of Standards and Technology (NIST). More information, including a behind the scenes video, is available on the NIST website: https://www.nist.gov/blogs/taking-measure/my-stay-home-lab-shows-how-face-coverings-can-slow-spread-disease
Credit: Matthew Staymates/NIST.