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Study Indicates That Humidity in Breath Makes Cotton Masks More Effective at Slowing Spread of COVID-19 A swatch of cotton fabric that has been exposed to high humidity typical of a person’s exhaled breath (left) filters out more droplets than a swatch of cotton fabric that has not been exposed to high humidity (right). Credit: NIST
Researchers have come up with a better way to test which fabrics work best for masks that are meant to slow the spread of COVID-19. By testing those fabrics under conditions that mimic the humidity of a person’s breath, the researchers have obtained measurements that more accurately reflect how the fabrics perform when worn by a living, breathing person.
Researchers have come up with a better way to test which fabrics work best for masks that are meant to slow the spread of COVID-19. By testing those fabrics under conditions that mimic the humidity of a person s breath, the researchers have obtained measurements that more accurately reflect how the fabrics perform when worn by a living, breathing person.
The new measurements show that under humid conditions, the filtration efficiency increased by an average of 33% in cotton fabrics.
A swatch of cotton fabric that has been exposed to high humidity typical of a person’s exhaled breath (left) filters out more droplets than a swatch of cotton fabric that has not been exposed to high humidity (right). Credit: NIST
Researchers have come up with a better way to test which fabrics work best for masks that are meant to slow the spread of COVID-19. By testing those fabrics under conditions that mimic the humidity of a person’s breath, the researchers have obtained measurements that more accurately reflect how the fabrics perform when worn by a living, breathing person.
Cave Paintings and Sculptures
A map of decorated caves in western Europe with the names of a few notable or outlying sites. The broken line encloses caves decorated in the distinctive Mediterranean Style which seems to have been little influenced by the master artists of France and Spain. It often features simple, stark animal representations together with quite elaborate geometrical designs. There are important caves decorated in the Mediterranean style in southeast Spain, the Ardèche canyons in southern France, the heel of Italy, and in Sicily.
There are now some 200 Painted caves known in southern France and northern Spain. Several new discoveries in the remote Spanish Basque country appear to be closing the gap between these two main regional groups which, in any case, certainly share many correspondences of style and theme.