particulate matter

When objects freeze due to liquid nitrogen, the particles inside them move much more slowly and the space between the particles almost disappears.

Heavy pollution caused China to be covered by thick haze and authorities had to issue a red alert, the highest warning level for low air quality in Beijing's capital.

Countless massive particles from Halley's comet rushed into the earth's atmosphere at speeds of up to 145,000 km / h and caught fire for a few seconds on the night of 20 and dawn