Thursday, September 10, 2009

What Is A Snowflake?


Snow is frozen water vapour. During the process of crystallization, these crystals are carried up and down in the atmosphere by air currents, during which they collect specks of dust or tiny drops of water on it. Gradually, these crystals become larger, so that soon there might be hundreds of crystals gathered around one nucleus.

When such a group becomes large enough, it begins to float down towards the ground and we call it a snowflake. The size of a snowflake depends on the temperature. The colder the temperature, the smaller the size of snowflakes formed. Some snowflakes are more than three centimeters in diameter.


Below Snowflake info from Wikipedia (

Snowflakes begin as snow crystals which develop when tiny supercooled cloud droplets (about 10 μm in diameter) freeze. Snowflakes come in a variety of sizes and shapes. Colder environments lead to column-like development of the flakes, while warmer temperatures lead to thin and flat crystal development. Complex shapes emerge as the flake moves through differing temperature and humidity regimes. Types which fall in the form of a ball due to melting and refreezing, rather than a flake, are known as graupel, with ice pellets and snow grains as examples of graupel. Snowflakes are used as a symbol for winter tires, and for the 2002 Winter Olympics.

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How Does Iron Rust?

Iron Rust

When water falls on iron, it reacts with the oxygen in the water and forms iron oxide. This is rust. The drop of water turns reddish in colour and the rust is suspended in the water. When the water drop evaporates, the rust remains there and forms a reddish coat on the iron itself.

Once started, rust spreads even in dry air. This is due to the fact helps whatever moisture is available in the air to condense in it. It also attracts the air and holds it. Here, the phrase, Prevention is better than cure is apt because it is easier to prevent rust from starting than to prevent it from spreading once it has started. Iron articles can be prevented from rusting by coating them with a special paint.


Below Iron Rust info from Wikipedia (

Rust is a general term for a series of iron oxides, usually red oxides, formed by the reaction of iron and oxygen in the presence of water or air moisture. Several forms of rust are distinguishable visually and by spectroscopy, and form under different circumstances.[1] Rust consists of hydrated iron(III) oxides Fe2O3·nH2O and iron(III) oxide-hydroxide (FeO(OH), Fe(OH)3). Rusting is the common term for corrosion of iron and its alloys, such as steel. Other metals undergo equivalent corrosion, but the resulting oxides are not commonly called rust. Given sufficient time, oxygen, and water, any iron mass eventually converts entirely to rust and disintegrates. The corrosion of aluminium is extremely slow because the resulting aluminium oxide forms a conformal coating, which protects the remaining aluminium. This process is known as passivation.

Wednesday, September 9, 2009

How Does Wind Originate?


In general, there are two types of winds. Those that are local and those that go long distances over the earth. The winds on the seashores are examples of local winds. During the daytime, the land gets heated, the air above it rises, and cool winds take its place from the sea. At night, the land is cooler than the sea, the hotter air above the sea rises up, and cool winds from the land take its place. Thus, this is a continuous process.

The hottest places on the earth are around the equator. The air above it rises and the place is filled by cold winds coming from the polar regions. The warm air moves to the polar regions and at certain latitudes it gets cooled and comes down.

The winds blowing towards the equator are the trade winds and those blowing towards the poles are called the westerlies.


Below Wind info from Wikipedia (

Wind is the flow of air or other gases that compose an atmosphere (including that of the planet Earth). On Earth and within other planetary atmospheres, wind consists of air molecules in motion. In outer space, solar wind is the movement of gases or charged particles from the sun through space, while planetary wind is the outgassing of light chemical elements from a planet's atmosphere into space. Differences in density between two air masses lead to wind. Winds are commonly classified by their spatial scale, their speed, the types of forces that cause them, the geographic regions in which they occur, and their effect. While wind is often a standalone weather phenomenon, it can also occur as part of a storm system, most notably in a cyclone. While winds on Earth can be strong, the strongest winds within a planet in our solar system lie on Neptune and Saturn.

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