What is Ice: Definition and 980 Discussions

Ice is water frozen into a solid state. Depending on the presence of impurities such as particles of soil or bubbles of air, it can appear transparent or a more or less opaque bluish-white color.
In the Solar System, ice is abundant and occurs naturally from as close to the Sun as Mercury to as far away as the Oort cloud objects. Beyond the Solar System, it occurs as interstellar ice. It is abundant on Earth's surface – particularly in the polar regions and above the snow line – and, as a common form of precipitation and deposition, plays a key role in Earth's water cycle and climate. It falls as snowflakes and hail or occurs as frost, icicles or ice spikes and aggregates from snow as glaciers and ice sheets.
Ice exhibits at least eighteen phases (packing geometries), depending on temperature and pressure. When water is cooled rapidly (quenching), up to three types of amorphous ice can form depending on its history of pressure and temperature. When cooled slowly, correlated proton tunneling occurs below −253.15 °C (20 K, −423.67 °F) giving rise to macroscopic quantum phenomena. Virtually all ice on Earth's surface and in its atmosphere is of a hexagonal crystalline structure denoted as ice Ih (spoken as "ice one h") with minute traces of cubic ice, denoted as ice Ic and, more recently found, Ice VII inclusions in diamonds. The most common phase transition to ice Ih occurs when liquid water is cooled below 0 °C (273.15 K, 32 °F) at standard atmospheric pressure. It may also be deposited directly by water vapor, as happens in the formation of frost. The transition from ice to water is melting and from ice directly to water vapor is sublimation.
Ice is used in a variety of ways, including for cooling, for winter sports, and ice sculpting.

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  1. L

    How much water is converted to ice?

    Homework Statement A 0.530 kg sample of liquid water and a sample of ice are placed in a thermally insulated container. The container also contains a device that transfers energy as heat from the liquid water to the ice at a constant rate P, until thermal equilibrium is reached. The...
  2. C

    I Optimizing homemade ice cream freezing with brine

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  3. V

    I Why is cooling with salt and ice so effective?

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  4. V

    Thermodynamics, bullet melting ice problem

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  5. J

    Mixing Ice and Water: Final Temp & Composition

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  6. J

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  7. Const@ntine

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  8. A

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  9. R

    Why are ice chests not vacuum insulated?

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  10. I

    B How can Greenland lose 269b tons/year and loose only 269km3?

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  11. Z

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  12. E

    Heat required to heat water and ice

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  13. S

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  14. P

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  15. Truman I

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  16. A

    I Where on the Moon should the first Moonbase be?

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  17. P

    Calorimetry: Finding mass of ice, water, steam left

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  18. J

    Writing: Input Wanted Eleven Inner Planets--What Will Earth's Ice Ages Be Like?

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  19. A

    I Could ice exist in Lunar lava tubes?

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  20. aatari

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  21. T

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  22. Nitesh Swarnakar

    B Why does ice piece sticks on hand but not wood piece?

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  23. K Wils

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  24. L

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  25. ElPimiento

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  26. Biker

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  27. C

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  29. FallenApple

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  30. W

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  31. C

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  32. MattNguyen

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  33. C

    Angular momentum: rotating ice skaters

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  34. mfb

    B Huge amounts of water ice found on Mars

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  35. N

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  36. Mayan Fung

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  37. luckyMee

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  38. Erenjaeger

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  39. S

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  40. Tafe

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  41. H

    Need help understanding this concept regarding melting ice

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  42. S

    Phase change material steady melt temp, like ice water?

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  43. terryds

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  44. DaveC426913

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  45. M

    MHB Ice cream & yogurt matrices problem

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  46. M

    MHB Ice Cream : NP-complete problem

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  47. S

    I Does ice really melts if in conctact with reservoir at 0°C?

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  48. S

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  49. K

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  50. S

    Does ice do work when it melts or freezes?

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