Search results for “filter penetration”

How do air filters work?

How do filters remove particles from the air and reduce exposure - especially the small ones? As this Risk Bites primer shows as it dives into the science of aerosol particle capture, it may not be how you think! Air filters are an important tool for protecting health, improving air quality, and

What are my sunglasses good for?

Sunglasses are important – and not just because they look cool: UV radiation can cause cataracts. But how do I know if my sunglasses really filter out UV radiation? Does it depend on the price? How does the protection work at all? You asked, we have the answers. More information about sun protection

How do face masks and respirators work?

How do face masks and respirators prevent you from breathing in harmful particles? As respiratory protection against coronavirus becomes increasingly important, Risk Bites dives into the science of face masks and respirators, and explores what makes for good protection, whether it’s a professional

How to find radioactive substances in the air

There are various methods for measuring radioactivity in the air. With the help of trace analysis, even very low concentrations of radioactivity in the air can be detected. In the video, Jacqueline Bieringer explains how to detect radioactive substances in the air. Original: "Federal Office for Rad

Hot Tub Laz-Y-Spa Honolulu Setup Instructions

I got something cool for my birthday: a hot tub! So I asked myself if these things are any good at all and if they are stable. After all, they are quite expensive! The setup took a solid 45 minutes. Filling it with water using a garden hose took another 1.5 hours. The water had about 24° Celsius d

Absorption of light in water

Water absorbs light. Red light is swallowed first, then other parts of the light spectrum. From about one kilometer, no more light penetrates into the depths. Authors: ZDF/Terra X/Hanna Kotarba/renderbaron Translation and dubbing: alugha Click here to see more videos: https://alugha.com/TerraX

How caves were created in the Caribbean

Glaciation during the ice ages caused the sea level to drop. Parts of the limestone reef platforms that form the bedrock of the Bahamas fell dry. Rain penetrated through cracks and dissolved the limestone, creating widely ramified karst caves. Author: ZDF/Terra X/R. Marel/S. Hillmann/C. Gerisch/A.

Development phase of an inflammation

If a foreign body penetrates the skin, phagocytes in the damaged tissue are the first to react. So-called M1-type macrophages release pro-inflammatory messenger substances. These include prostaglandins. These hormones trigger a pain stimulus. Author: 3sat/nano/DOCUVISTA Filmproduktion/Marilena Schu