​Blowing out a candle test

is to blow out a candle with your mask on. This test is popularised by U.S. science educator Bill Nye and can help to determine the filtration and fit of your mask. In this, all you have to do is blow out a candle with your mask on. If you can do it successfully, that means your mask is not good enough and cannot prevent the aerosolized particles. Whether you wear these masks or not, it will hardly matter as you will be at risk of getting infected by the virus.