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Japanese researchers have virtually tested how saliva spreads with a world-class supercomputer.

I experimented with various situations, such as in a car or under an indoor ventilation, and the conclusion is that it is most important to use a'mask' properly in any situation.



This is Tokyo's correspondent Yoo Seong-jae.



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is a video of a virtual experiment using the world's best supercomputer'Fugaku' with a calculation speed of 44 scenes per second and 2,000 trillion circuits.



Inside a taxi that carries two passengers and runs at 40 km/h.




When an unmasked rear-seat passenger coughs, only 10% of the droplets are released even when the windows are opened diagonally back and forth.



However, if the window is closed and the air conditioner is operated at maximum power by inflow of outside air, air circulates in 45 seconds, leaving almost no splash.



[Tsubokura/Kobe University Professor: The window opening effect cannot be expected very much.

Rather, increasing the air volume of the air conditioner is more effective for ventilation.] In



particular, if both the driver and passengers are wearing masks with the air conditioner turned on, the spread of droplets and thus the risk of infection are minimized.



Even in a karaoke room with ventilation holes on the ceiling, if you start singing without wearing a mask, the droplet will spread throughout the room after 30 seconds.



On the other hand, it has been confirmed that the spread of the droplets is suppressed as much as possible by wearing a mask and singing while standing right under the vent.



The air is usually purged within three minutes inside an airplane with always-on ventilation, but droplets have been shown to spread the farthest when an unmasked passenger coughs with the seat back.



The researchers said that the experiment confirmed the ventilation effect of air conditioning devices such as air conditioners, but said that wearing a mask correctly can suppress the spread of droplets as much as possible in any case.



(Video coverage: Moon Hyun-jin, screen source: Japan Institute of Science and Chemistry)  



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