Sunday, 25 January 2015



The wavelength is defined as the distance between two successive points in the same phase of a wave motion, for example, the distance between two crests or between two successive wave breasts, and electromagnetic radiation.

The wavelength is inversely proportional to the frequency, ie the number of repetitions per unit time, usually seconds.

Longitud Cuando an airline pilot or captain of a cruise want to communicate via radio its position on the planet, it have two numerical values, which form a coordinate, called latitude and longitude. These are angles, measured in degrees, minutes and seconds of arc. Such classifications, however, can be shortened depending on the context, omitting "arc", provided it is understood that we are not talking time.

The latitude lines intersect the earth from side to side, and measure the angle formed between any part of the planet and its center. Thus, the globe has a series of rings that surround it, where passing through Ecuador has the largest diameter and located at the poles are just points.

Furthermore, a number of lines connecting the poles and having constant length; are called meridians. They cross the Ecuador, which is divided into 360 degrees; thus, to know the length of a given point, just know what latitude angle in question falls meridian.

Study in Saudi Arabia

Study in Saudi Arabia

Capital: Riyadh
Official languages: Arabic
Government: Unitary Islamic absolute monarchy
Population: 29,195,895
Gross Domestic Product: $ 906.806000000000
Currency: Saudi Riyal (SAR)
Time Zone: (GMT + 3)

Saudi Arabia, officially known as the Kingdom of Saudi Arabia is the largest Arab country in Western Asia by land area and second largest in the Arab world. Saudi Arabia has the largest reserves in the world 's oil is heavily concentrated in the Eastern Province. Financial oil accounts for 95% of exports and 70% of government revenues, although the proportion of non-oil economy has been growing recently. This has facilitated the alteration of an underdeveloped desert kingdom one of the richest countries in the world's.

The School System In The U.S

The School System In The U.S

In the US there is a Compulsory education usually until 16 or 18 years, depending on the state. 
The three-tier school system with high school, junior high school and high school, as in Germany does not exist in the United States. Differently gifted children attend a school together instead.

The schooling of a child in America begins with the six-year "Elementary School", which already starts with the kindergarten and going up to the 6th or 8th grade. In grades 7 to 9, it then goes to the "Middle School" or "junior high school". Students of "high school", which is comparable to the total German school visit. This school visit the American youth from grades 9 to 12 and 10 to 12.

The completion of high school entitles you to attend a university. In the US, the university education has a particularly high status. Thus, the United States that nation with the highest percentage of young people who attend a university.

The school system is a state, which means that until the completion of general compulsory education all have the opportunity to go to school for free. This offer is made of 90% of the students to complete. The remaining 10% attend private schools in the country.

The Water


CAS-No. 7732-18-5
formula H2O
Molar mass (1) ... 18.01471
18.01599 g / mol
Melting point of 0.0 ° C
Boiling point 99.97 ° C
3.98 ° C
20 ° C
1.00g / cm3
0.998203 g / cm3
Refractive index [25 ° C] 1.33251
Dielectric constant. [20 ° C] 80.35

Water is the liquid which dissolves in many more substances (universal solvent), this property is due to its ability to form hydrogen bonds with other substances, as these will dissolve when interacting with the polar water molecules.

Solvent capacity is responsible for two important roles for living things: the environment in which run the majority

Reactions of nutrient supply and metabolism and waste disposal are done through aqueous transport systems.

A 20 540 calories for a gram of water evaporation is needed, which is indicative of the energy required to break the hydrogen bonds between the molecules set of liquid water and subsequently to provide these molecules sufficient kinetic energy to leave phase transition to the liquid and vapor.

The Steam Engine

Steam engine

Around 1680 A French physicist Denis Papin invented the Papinschen pot and the associated safety valve for excess pressure. He discovered the first possibility to use the steam to performing work.
English engineer Thomas Savery was the first who built the steam pump for water elating in mines. Savery also provides a measurement of the performance of a machine - the word horsepower (power, which is accomplished when a weight of 75 kg lifted within a second to a meteris).

In 1765, James Watt, Scottish inventor, developed the 1st usable steam engine. Together with the manufacturer Matthias Boultin he founded 1774 engineering works. The most famous invention, the sun and Planetary-wheel gear, transforms the up and down movement of the piston rod in a rotating motion.

In 1972 was begun in Wuppertal Lutz Hielscher with the manufacture of steam engines in the model and technical toys.

In 1994 the production of technical toys in model runs back up to full speed. 

For example:

From the monorail in Wuppertal, steam railways (H0, G, I), steam engines, Stirling engines, vacuum motors, steam cars, and turbines. They are always available as a factory built or kit.