But due to the small size of the particles and their large quantity, it's difficult to accurately study them. (sciencedaily.com)
The small size of these particles have been linked to many health problems as they can easily pass into the lungs. (cheapcarinsurance.net)
«For the same size of droplet and the same size of particle, when the collision happens with the same velocity, it always behaves the same way.» (sciencedaily.com)