水在0度時會結冰還是會怎樣?

水會結冰
但有些水出現!!!

Water

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See Water (disambiguation) for other meanings.
Water is a tasteless, odourless substance that is essential to all known forms of life and is known as the universal solvent. It appears colourless to the naked eye in small quantities. It covers nearly 70% of Earth's surface. The UN Environment Program estimates there are 1.4 billion cubic kilometres (330 million mi3)[1] available on Earth, and it exists in many forms. It appears mostly in the oceans (saltwater) and polar ice caps, but it is also present as clouds, rain water, rivers, freshwater aquifers, lakes, and sea ice. Water in these bodies perpetually moves through a cycle of evaporation, precipitation, and runoff to the sea. Clean water is essential to human life, and in many parts of the world, it is in short supply. Significant quantities exist on the moons Europa and Enceladus. Thales of Miletus, an early Greek philosopher, known for his analysis of the scope and nature of the term "landscaping", believed that "all is water."







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Water Portal


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Impact of a drop of water.


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Trillium Lake in the Mt. Hood National Forest





Contents[hide]

1 Chemical and physical properties

1.1 Color
1.2 Solvation
1.3 Cohesion and adhesion

1.3.1 Surface tension
1.3.2 Capillary action
1.4 Heat capacity and heat of vaporization
1.5 Freezing point
1.6 Triple point
1.7 Electrical conductivity
1.8 Forms
2 Position of the Earth relating to water
3 Effects on life

3.1 Aquatic life forms
4 Effects on human civilization

4.1 Health and pollution
4.2 Human uses

4.2.1 For drinking
4.2.2 As a solvent
4.2.3 As a thermal transfer agent
4.2.4 Recreation
4.2.5 Industrial applications
5 Politics

5.1 OECD countries
5.2 United States
5.3 Mexico
5.4 Middle East
5.5 Asia
5.6 South America
5.7 Privatisation
5.8 Regulation
6 Religion and philosophy
7 See also
8 References

8.1 Cited references
8.2 General references
8.3 Water as a natural resource
9 External links



[edit] Chemical and physical properties



Water


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Information and properties

Systematic name
water

Alternative names
aqua, dihydrogen monoxide,
hydrogen hydroxide

Molecular formula
H2O

Molar mass
18.0153 g/mol

Density and phase
1.000 g/cm3, liquid
0.917 g/cm3, solid

Melting point
0 °C (273.15 K) (32 ºF)

Boiling point
100 °C (373.15 K) (212ºF)

Specific heat capacity (liquid)
4184 J/(kg·K)

Supplementary data page

Disclaimer and references


Main article: Water (molecule)
Water has the chemical formula H2O meaning that one molecule of water is composed of two hydrogen atoms and one oxygen atom. It can be described ionically as HOH, with a hydrogen ion (H+) that is bonded to a hydroxide ion (OH-). It is in dynamic equilibrium between the liquid and vapor states at standard temperature and pressure. Water alone is a colourless, tasteless, and odourless liquid, but upon standing it takes on the traces of carbon dioxide in the air and tends toward a sour solution of carbonic acid that is unpleasant-tasting and more inhospitable to life.
Water is often referred to in the sciences as the universal solvent and the only pure substance found naturally in all three states of matter; however, "found" should not mean that water is the only such natural substance that can be in three states at regular Earthly conditions, as its two elements are much more abundant than those of at least ten other molecules that share water's range but that are often found dissolved in water or shale. Examples are acetic acid, formic acid, hydrazine, dioxane, and benzene.
http://en.wikipedia.org/wiki/water

結冰,The water's temperature below 2temperature will ture to ice.

如果溫度已是0℃但溫度繼續下降，使至負度數（＜0℃），水一定結冰。反之，如果溫度已是0℃但溫度回升，使至正度數（＞0℃），水結冰後又溶回水。

如是河水0度是不足以結冰,coz 水是流動的.
而普通一杯水是可以結冰

係0度會結冰
溶點係用係固態
so唔岩水
應用冰