File:ISGrønn hielo tallado.jpg
![File:ISGrønn hielo tallado.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/ISGr%C3%B8nn_hielo_tallado.jpg/800px-ISGr%C3%B8nn_hielo_tallado.jpg?20190130053240)
Original file (1,280 × 855 pixels, file size: 192 KB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit]DescriptionISGrønn hielo tallado.jpg |
Norsk bokmål: IS Grønnenn 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.
Den spesifikke smeltevarmen (per kg) til is er den høyeste av noe kjent stoff og smeltende is absorberer like mye varmeenergi mens temperaturen er konstant 0 °C, som går med til å øke temperaturen i en tilsvarende stor masse (flytende) vann fra 0° til 80 °C. Det er også mulig å varme opp is til over smeltepunktet. Ved å bruke ultraraske laserpulser kan klar is varmes opp til romtemperatur i løpet av kort tid uten at den smelter. Det er sannsynlig at det indre av en iskrystall har et smeltepunkt over 0 °C og at det er overflaten som smelter ved 0 °C.[1] Siden is er et krystallformet legeme som oppstår naturlig, blir det regnet for å være et mineral. Den minste isen noensinne ble laget av Roger Miller og Klaus Nauta ved Universitetet i North Carolina i 1999. Den bestod av 6 vannmolekyl i en sekskant, teoretisk sett det minste iskrystallet som kan eksistere. Romerne regnes forøvrig å være de første til å bruke is i alkoholholdige drinker.[trenger referanse]English: IS Green name the density of water, so water is one of the very few substances that expands when it freezes, the other fairly 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.
The specific heat of fusion (per kg) of ice is the highest of any known substance and melting ice absorbs the same amount of heat energy while the temperature is constant at 0 °C, which goes into raising the temperature of a similarly large mass of (liquid) water from 0° to 80 °C. It is also possible to heat ice to above the melting point. By using ultra-fast laser pulses, clear ice can be heated to room temperature within a short time without melting. It is likely that the interior of an ice crystal has a melting point above 0 °C and that it is the surface that melts at 0 °C.[1] Since ice is a crystalline body that occurs naturally, it is considered to be a mineral. The smallest ice ever was made by Roger Miller and Klaus Nauta at the University of North Carolina in 1999. It consisted of 6 water molecules in a hexagon, theoretically the smallest ice crystal that could exist. Incidentally, the Romans are considered to be the first to use ice in alcoholic drinks.[citation needed] |
Date | |
Source | Own work |
Author | Oushan Chen Chen |
Licensing
[edit]![w:en:Creative Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/CC_some_rights_reserved.svg/90px-CC_some_rights_reserved.svg.png)
![attribution](https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Cc-by_new_white.svg/24px-Cc-by_new_white.svg.png)
![share alike](https://upload.wikimedia.org/wikipedia/commons/thumb/d/df/Cc-sa_white.svg/24px-Cc-sa_white.svg.png)
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 05:32, 30 January 2019 | ![]() | 1,280 × 855 (192 KB) | Oushan Chen Chen (talk | contribs) | Cross-wiki upload from es.wikipedia.org |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
JPEG file comment | File source: http://commons.wikimedia.org/wiki/File:IceBlockNearJoekullsarlon.jpg |
---|