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↓↓

A simple Schlieren imaging technique is applied to visualize the air flow caused by a person breathing and coughing. Using a face mask the exhaled air flow is blocked reducing effectively the risk of infection https://t.co/o1V5uYupph pic.twitter.com/bGTXqe0kUQ

— Massimo (@Rainmaker1973) April 5, 2020

Visualizing the air flow of a (breathing/coughing) person through Schlieren imaging technique with or without protective measures. pic.twitter.com/4DSX2fYL05

— Fhd.alk (@fhdalkhaldii) April 5, 2020