free download PNG images :Ice

Ice is water that freezes into a solid state. Depending on the presence of impurities (such as soil particles or bubbles), it may appear as transparent or more or less opaque blue white.

In the solar system, ice is abundant, and naturally occurs from the sun to places close to mercury, and then to objects far away from the Ott cloud. In addition to the solar system, it also appears in the form of interstellar ice. It is very abundant on the earth's surface - especially in polar areas and above the snow line - and as a common form of precipitation and deposition, it plays a key role in the earth's water cycle and climate. It falls like snowflakes and hailstones, or because of frost, icicles or icebergs appear.

Ice molecules can exhibit seventeen or more different phases (stacking geometry) depending on temperature and pressure. When water cools rapidly (abruptly), up to three different types of amorphous ice can be formed according to its pressure and temperature history. When cooled, the relevant proton tunneling occurs below 20 K, which leads to macroscopic quantum phenomena. In fact, all the ice on the earth's surface and in the atmosphere is hexagonal crystal structure, called ice Ih (called "ice hour"), and the trace cube ice is called ice IC. When liquid water is cooled below 0 ° C (273.15k, 32 ° f) at standard atmospheric pressure, the most common transition is ice Ih. It may also be deposited directly by water vapor, such as frost formation. The transition from ice to water is melting, and the transition from ice to water vapor is sublimating.

Ice is used in many ways, including cooling, winter sports and ice sculpture.

In this gallery, you can download free pictures: free ice, ice pictures