视频：戴不戴口罩区别有多大？国外公司做了个实验...

                       
疫情之下，戴口罩到底有没有用这个问题，让很多西方网友感到头大。

最近，国外一家公司利用Schlieren光学成像技术来比较了戴口罩与不戴口罩的区别，一起来感受一下↓↓







<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/o1V5uYupph pic.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>