Studies have shown that humidity can prolong the survival time of new coronavirus by 23 times

It is clear that the new coronavirus can be transmitted by sneezing, coughing and even simply speaking and breathing, Spain reported on August 18. For this reason, the physics community is eager to know how the virus spreads through the air and how long it stays active in the air. And the humidity in Missouri’s recent scientific research has shown that the new moisture drops can prolong the life span of the virus by 23 times. The size of droplets exhaled by normal people varies from about 1 / 10 μ m to 1000 μ m, according to the report. In contrast, a human hair is about 70 microns in diameter, and less than one tenth of the typical NCV particles. < / P > < p > studies have shown that humidity affects the fate of droplets exhaled by infectious individuals, as dry air accelerates natural evaporation. In the air with 100% relative humidity, the simulation shows that the larger droplets with the diameter of 100 μ M can drop to the ground about two meters away from the expiratory source, while the smaller droplets about 50 μ M can spread further in the humid air, and even reach 5 meters away. This is consistent with the conclusion that there is still live virus at a distance of 4.8 meters from patients with new crown infection To. In contrast, dry air can block the spread of the virus: at 50% relative humidity, no drop of 50 microns can spread more than 3.5 meters. < p > < p > according to the report, the researchers said that if the viral load associated with droplets was proportional to the volume, almost 70% of the virus would settle on the floor during coughing. Therefore, maintaining physical distance will greatly reduce the spread of the disease by reducing droplet deposition on people and reducing the possibility of inhaling aerosols near the source of infection. Focus