The Astounding Physics of N95 Masks

N95 masks are designed to filter airborne particles using a combination of mechanical and electrostatic methods. Unlike strainers, they capture particles smaller than the gaps between fibers by using multiple layers and an electric field. The masks are effective against both large and small particles, but medium-sized particles are harder to filter. Proper fit is crucial for effectiveness, and certain decontamination methods can damage the mask's properties. N95 masks are essential for healthcare workers, especially during shortages, and require careful handling to maintain their filtering capabilities.

How do N95 masks differ from strainers in their filtering mechanism?

• They use a mesh of fibers with small gaps.

• They rely on a sticky spider web-like structure.

• They filter particles larger than their openings.

• They allow small particles to pass through.

What is the main challenge in filtering medium-sized particles with N95 masks?

• They travel in straight lines.

• They bounce around randomly.

• They are carried with the air flow.

• They are too large to be filtered.

What happens to particles larger than a thousandth of a millimeter in N95 masks?

• They bounce around randomly.

• They travel in straight lines and hit fibers.

• They are carried past fibers by air flow.

• They are too small to be filtered.

How do N95 masks use electric fields to enhance particle filtration?

• By increasing the size of the fibers.

• By creating a magnetic field.

• By using static electricity like a cat's fur.

• By developing an internal electrical imbalance in particles.

What is the significance of the '95' in N95 masks?

• It indicates the number of layers in the mask.

• It signifies the percentage of medium-sized particles filtered.

• It denotes the size of particles the mask can filter.

• It represents the percentage of large particles filtered.

What is the primary factor affecting the performance of an N95 mask?

• The number of layers in the mask.

• The proper fit on the face.

• The size of the particles.

• The material of the mask.

Why is it important to avoid certain decontamination methods for N95 masks?

• They can damage the electrostatic properties.

• They can increase the mask's weight.

• They can make the mask too tight.

• They can change the color of the mask.