According to physics, this is why you need to wash your hands for 20 seconds
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Physicists have come up with the perfect way Hand wash Wipe out bacteria and virus particles, including new coronaviruses. They found that it took about 20 seconds to get rid of virus and bacterial particles from their hands. It should sound familiar — it is in line with what most public health professionals recommend.
Published in the journal on Tuesday (August 16th) for research Fluid physics, Researchers have created a simple mathematical model to simulate the movement of particles during hand washing (such as viral and bacterial particles). In the model, the hand is represented by two rough surfaces that pass through each other, separated by a thin film of liquid (to mimic rubbing the hands together).
The model showed that particles are attracted to a rough surface and require a certain amount of energy to allow them to escape into the fluid. The authors say that the faster the hand moves, the stronger the fluid flow and the easier it is for particles to be removed.
Research author Paul Hammond, a scientific consultant at Hammond Consulting Limited, said: In England Said in a statement.. Hammond likened the situation to removing stains on a shirt. The faster scrubbing action removes dirt more easily.
Using reasonable estimates of variables, including the speed of hand movement, the model revealed that it takes about 20 seconds for the particles to escape.It is in line with the recommendations from Centers for Disease Control and Prevention (CDC)We advise you to wash your hands with soap and water for 20 seconds, or as long as singing “Happy Birthday” twice.
Not based on CDC recommendations Physics Studying the level of microorganisms that remain in the hands after washing for a specific period of time, not modeling.
Hammond said the new study did not take into account the biological effects of soap bar.. Soap not only helps remove dirt and bacteria from your hands, but it also destroys the membranes that surround the particles of viruses and bacteria, destroying them.
Future research needs to take into account this “chemical attack” from soap, but current research is laying the groundwork, Hammond said.
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