File:ISGrønn.jpg
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Norsk bokmål: Et uvanlig trekk ved is som er frosset ved trykk på en atmosfære er en tetthet som er omtrent 8% mindre enn tettheten til vann, så vann er et av ytterst få stoffer som utvider seg når den fryser, det andre noenlunde kjente stoffet er silisium. Is har en tetthet på 0,917 g/cm³ ved 0 °C, mens vann har en tetthet på 0,9998 g/cm³ ved samme temperatur. Flytende vann har størst tetthet (er tyngst) omtrent 1,00 g/cm³ ved 4 °C, og blir lettere ved at vannmolekylene danner sekskantede iskrystaller når temperaturen går under 0 °C (Ordet "krystall" kommer fra det greske ordet for frost). Dette kommer av hydrogenbånd som oppstår mellom vannmolekylene og setter opp molekylene mindre effektivt (med tanke på volum) når vannet er frosset. Resultatet av dette er at is flyter på flytende vann, en viktig faktor for klimaet på Jorda. Tettheten til is øker noe ved synkende temperatur, slik at tettheten til is ved −180 °C er 0,9340 g/cm³. English: An unusual feature of ice frozen at pressure of one atmosphere is a density about 8% less than that of water, so water is one of the very few substances that expands when it freezes, the other a fairly well-known substance is silicon. Ice has a density of 0.917 g/cm³ at 0 °C, while water has a density of 0.9998 g/cm³ at the same temperature. Liquid water has the greatest density (is heaviest) of about 1.00 g/cm³ at 4 °C, and becomes lighter as the water molecules form hexagonal ice crystals when the temperature drops below 0 °C (The word "crystal" comes from the Greek word for frost) . This comes from hydrogen bonds that occur between the water molecules and set the molecules up less efficiently (in terms of volume) when the water is frozen. The result of this is that ice floats on liquid water, an important factor for the climate on Earth. The density of ice increases somewhat with decreasing temperature, so that the density of ice at −180 °C is 0.9340 g/cm³. |
| Date | |
| Source | Own work |
| Author | Oushan Chen Chen |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:56, 4 October 2023 | | 1,024 × 682 (152 KB) | R8cocin8 (talk | contribs) | removed watermark and adjusted exposure |
| 13:28, 29 January 2019 |  | 1,024 × 682 (158 KB) | Oushan Chen Chen (talk | contribs) | Cross-wiki upload from es.wikipedia.org |
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