<blockquote class="twitter-tweet tw-align-center">
A simple Schlieren imaging technique isapplied to visualize the air flow caused by a person breathing andcoughing. Using a face mask the exhaled air flow is blockedreducing effectively the risk of infection https://t.co/o1V5uYupphpic.twitter.com/bGTXqe0kUQ
― Massimo (@Rainmaker1973) April 5, 2020</blockquote><blockquote class="twitter-tweet tw-align-center">
Visualizing the air flow of a(breathing/coughing) person through Schlieren imaging techniquewith or without protective measures. pic.twitter.com/4DSX2fYL05
― Fhd.alk (@fhdalkhaldii) April 5, 2020</blockquote>