![]() The interior of the box was painted black. We directed this light sheet through slits on the sides of a cardboard box measuring 53×46×62 cm. The output from a 532-nm green laser operating at 2.5-W optical power was transformed into a light sheet that was approximately 1 mm thick and 150 mm tall. 2 We report the results of a laser light-scattering experiment in which speech-generated droplets and their trajectories were visualized. Whereas large droplets fall quickly to the ground, small droplets can dehydrate and linger as “droplet nuclei” in the air, where they behave like an aerosol and thereby expand the spatial extent of emitted infectious particles. The act of speaking generates oral fluid droplets that vary widely in size, 1 and these droplets can harbor infectious virus particles. (00:42)Īerosols and droplets generated during speech have been implicated in the person-to-person transmission of viruses, 1,2 and there is current interest in understanding the mechanisms responsible for the spread of Covid-19 by these means. Laser Light-Scattering Experiment Showing Speech-Generated Droplets. ![]() The most trusted, influential source of new medical knowledge and clinical best practices in the world. Information and tools for librarians about site license offerings. Valuable tools for building a rewarding career in health care. The authorized source of trusted medical research and education for the Chinese-language medical community. The most advanced way to teach, practice, and assess clinical reasoning skills. Information, resources, and support needed to approach rotations - and life as a resident. The most effective and engaging way for clinicians to learn, improve their practice, and prepare for board exams. NEW! Peer-reviewed journal featuring in-depth articles to accelerate the transformation of health care delivery.Ĭoncise summaries and expert physician commentary that busy clinicians need to enhance patient care. NEW! A digital journal for innovative original research and fresh, bold ideas in clinical trial design and clinical decision-making.
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