NOV 25, 2020 5:56 AM PST

The physics behind the face mask

A study published in Physics of Fluids investigates the physics of face masks to better comprehend how we can effectively combat the COVID-19 virus that has spread worldwide in the last year. The study explores how design, material, and comfort impact the effectiveness of face masks in preventing disease transmission.

From their analysis, the researchers determined that face masks made from hybrid polymer materials are the most efficient at simultaneously filtering particles at high efficiency and maintaining a comfortable face temperature for the user, a feature which has been shown to be imperative for maintaining continued, effective mask use. As the researchers report, hybrid polymer fibers are especially effective in this sense because they are transparent to infrared radiation, which permits heat to escape.

Photo: Pexels

The thermal comfort feature comes into play particularly for essential workers for must wear face masks for many hours at a time, and even more so in hot, humid settings.

"There could be some relation between breathing resistance and the flow resistance of the face mask which will need to be studied for a face mask-wearing interval," said author Heow Pueh Lee. "Also, the environmental condition in the compartmental space within the face mask will need to be more accurately quantified using miniaturized sensors and the development of human replicas for such studies."

In conducting their study, the researchers considered epidemiological studies that looked at the impact that face masks have on reducing the effective reproduction number. In epidemiology, the reproduction number refers to the reproductive ratio of an infection. If the reproduction number drops below 1, the epidemic stops spreading.

In considering one particular study of COVID-19 data from New York, author Sanjay Kumar comments: "The results suggest that the consistent use of efficient face masks, such as surgical masks, could lead to the eradication of the pandemic if at least 70% of the residents use such masks in public consistently. Even less efficient cloth masks could also slow the spread if worn consistently."

As Kumar implies, different types of masks have different capabilities. While cloth masks may be effective at stopping the expelling of fluid droplets from the nose and mouth measuring 5-10 microns, only N95s are capable of filtering out aerosol-sized droplets of less than 5 microns.

Sources: Physics of Fluids, Eureka Alert

About the Author
  • Kathryn is a curious world-traveller interested in the intersection between nature, culture, history, and people. She has worked for environmental education non-profits and is a Spanish/English interpreter.
You May Also Like
JAN 10, 2021
Chemistry & Physics
Documenting biological magnetoreception in living cells
JAN 10, 2021
Documenting biological magnetoreception in living cells
New research published recently in the Proceedings of the National Academy of Sciences from a team of scientists fr ...
JAN 18, 2021
Chemistry & Physics
Watching the eletronic signals of a wandering mind
JAN 18, 2021
Watching the eletronic signals of a wandering mind
A study published recently in the Proceedings of the National Academy of Sciences contemplates the places our minds ...
FEB 22, 2021
Chemistry & Physics
New hydrogels mimic biological tissue but are even stronger
FEB 22, 2021
New hydrogels mimic biological tissue but are even stronger
In a new study recently published in Nature, researchers from UCLA describe a process they have developed to produc ...
APR 01, 2021
Cell & Molecular Biology
Solubility Factors When Choosing a Solvent
APR 01, 2021
Solubility Factors When Choosing a Solvent
Solubility Factors When Choosing a Solvent Solubility functions by a group of rules that determine how dissolvable a sub ...
MAR 31, 2021
Space & Astronomy
Were These the First Structures in the Universe?
MAR 31, 2021
Were These the First Structures in the Universe?
It's been theorized that our Universe started as a hot, incredibly dense point that exploded in the Big Bang. It's thoug ...
APR 19, 2021
Chemistry & Physics
Breaking down the mathematical laws of forests
APR 19, 2021
Breaking down the mathematical laws of forests
Researchers from the Santa Fe Institute (SFI) have published a new study in the Proceedings of the National Academy of S ...
Loading Comments...