基于病毒在空气中主要的存在形式是依附于人体正常呼吸或者咳嗽、打喷嚏所形成的微小液滴.本文主要考虑了半径在0.05~100 μm范围内的液滴在平静空气中的动力学行为，发现当液滴的半径接近100 μm时, 在平静空气中的停留时间小于2 s，咳嗽和打喷嚏时喷出的液滴可以将病毒最远携带至 0.61 m处；而当液滴半径范围在1~10 μm 时，悬浮的液滴会携带病毒在空气中存在长达3.7 h；而当液滴半径接近病毒线度时，病毒会在平静的空气中存在25天，同时也会在空气中发生相对明显的扩散.

 Based on the main existing form of viral in the air being attached to tiny droplets from normal breathing or coughing and sneezing, we mainly consider those droplets’ temporal and space dynamics with radius of 0.05~100μm in calm air. It is found that the drops with radiuses are close to 100μm stay in the air less than 2 seconds, which can carry the virus away up to 0.61m when one cough or sneeze. When the radius is in the range of 1~10μm the floating droplets carrying with virus can survive 3.7 hours in the air. While the droplet’s dimension is close to the viral’s it will be present in calm air for nearly one month, and will also have significant diffusions in the air.