Masks actually have kind of a funny response curve (see 5th page of linked PDF). The masks are basically made out of layers of tiny (as small as 1um) fibres that force the air to weave through them to get to you. Larger…
Masks actually have kind of a funny response curve (see 5th page of linked PDF). The masks are basically made out of layers of tiny (as small as 1um) fibres that force the air to weave through them to get to you. Larger…