Brass wind instruments with long sections of cylindrical pipe, such as trumpets and trombones, sound “brassy” when played at a fortissimo level due to the generation of a shock front in the instrument. It has been suggested that these shock fronts may increase the spread of COVID-19 by propelling respiratory particles containing the SARS-CoV-2 virus several meters due to particle entrainment in the low pressure area behind the shocks. To determine the likelihood of this occurring, fluorescent particles, ranging in size from 10–50 μm, were dropped into the shock regions produced by a trombone, a trumpet, and a shock tube. Preliminary results indicate that propagation of small airborne particles by the shock fronts radiating from brass wind instruments is unlikely.

中文翻译：

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“粗俗”的发声乐器是否需要增加安全间隔距离要求以最小化COVID-19的扩散？

具有长形圆柱管的铜管乐器，例如喇叭和长号，由于在乐器上产生冲击前音而在宽容状态下演奏时听起来“很黄铜”。已经表明，由于冲击后低压区域的颗粒夹带，这些冲击前沿可能通过将含有SARS-CoV-2病毒的呼吸颗粒推进几米而增加COVID-19的传播。为了确定发生这种情况的可能性，将大小为10–50μm的荧光颗粒滴入了由长号，小号和震动管产生的震动区域。初步结果表明，由铜管乐器辐射出的激波前沿不可能传播小颗粒的空气。