What is Dry Ice?

Dry ice is solid carbon dioxide, which is obtained by condensing carbon dioxide into a colorless liquid at a pressure of 6250.5498 kPa.

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The process of dry ice cleaning, which uses the kinetic energy of compressed air

Dry ice cleaning has been widely used in the foundry industry around the world. Most of the foundry industry has changed to dry ice cleaning to clean sand core molds and

Scientists successfully find mobile matter in Mars's deep valley for the first time

Dr. Nick Hoffman, a geologist at the University of Irvine, found signs of the process of activity flowing in valleys and river channels in the polar regions on a Mars surface photo taken by the Mars Global Probe.

Dr. Huffman presents his new evidence in a new issue of Astrobiology. When the temperature of Mars is minus 130 ° C in spring, ice and snow filled with carbon dioxide are flowing in the gullies, so cold At low temperatures, even the acid in the battery will turn into a cobblestone. Water cannot move at such low temperatures, so carbon dioxide flows in the Martian Gully. But liquid carbon dioxide cannot exist on Mars, because carbon dioxide will directly change from solid to gaseous (so-called sublimation). Obviously, a "fluid" is an avalanche or ice avalanche of "boiling" dry ice with sand, dust, and stones.

Dr. Huffman pointed out, "This discovery can dispel people's illusions about the existence of life on Mars. If all the young gullies on Mars are formed by the same mechanism, NASA claims that life exists near the surface of Mars. It is impossible There will be no liquid water, and despite numerous reports of large amounts of water ice found on Mars not long ago, NASA has not found liquid water. "

Dr. Huffman believes that the discovery of the active "fluid" on Mars was itself an epoch-making discovery, because before that fire

dry ice

The star is absolutely stationary, if you don't notice its dust storm. Gullies on Mars are the most likely choice for finding liquid water on Mars today. Many NASA experts have focused their attention on the search for mechanisms that can explain the formation of gullies under the erosion of water currents. , But before that no one could see the gully "flowing."

Dry ice is solid carbon dioxide. Because dry ice has a very low temperature, which is minus 78.5 degrees Celsius, it is often used to keep objects frozen or cold. Dry ice can freeze objects quickly and reduce temperature, and has been widely used. When dry ice is dissolved, it is not converted from a solid to a liquid, but is directly sublimated into a gaseous state from the solid, so its melting does not produce any water or liquid, which is why we call it "dry ice".

American scientists announced in 2006 that they had discovered a "dry ice fountain" on Mars that could spray dry ice up to hundreds of feet.

Scientists said that through a camera mounted on the Mars probe Odyssey, they found that dry ice on Mars' south pole spewed like a fountain at a speed of 100 miles per hour.

According to the BBC, photos show that dry ice ejected from inside Mars carried a lot of dust, leaving various black marks on the ice sheet.

Scientists explained that the surface of Mars was warmed by the sun, melting dry ice that was originally frozen, forming high-pressure gas, and ejecting at high speed.

Dr. Christensen of Arizona State University said, "If you are there, you will find yourself standing on a thick layer of dry ice. And by your side, the dry ice is constantly ejecting from the ground Hundreds of feet above the ground brought a lot of dust. "

"A similar phenomenon does not exist on Earth," Kristensen said. ^[2]