Electric field -In physics, the space surrounding an electric charge or in the presence of a time-varying magnetic field has a property called an electric field. This electric field exerts a force on other electrically. The concept of an electric field was introduced by Michael Faraday.
The electric field is a vector field with SI units of newtons per coulomb (N C⁻¹) or, equivalently, volts per metre (V m⁻¹). The SI base units of the electric field are kg·m·s⁻³·A⁻¹. The strength of the field at a given point is defined as the force that would be exerted on a positive test charge of +1 coulomb placed at that point; the direction of the field is given by the direction of that force. Electric fields contain electrical energy with energy density proportional to the square of the field intensity. The electric field is to charge as gravitational acceleration is to mass and force density is to volume.
A moving charge has not just an electric field but also a magnetic field, and in general the electric and magnetic fields are not completely separate phenomena; what one observer perceives as an electric field, another observer in a different frame of reference perceives as a mixture of electric and magnetic fields. For this reason, one speaks of "electromagnetism" or "electromagnetic fields." In quantum mechanics, disturbances in the electromagnetic fields are called photons, and the energy of photons is quantized.
source: http://en.wikipedia.org/wiki/Electric_field

Mineral oil

All oils, with their high carbon and hydrogen content, can be traced back to organic sources. Mineral oils, found in porous rocks underground, are no exception, as they were originally the organic material, such as dead plankton, accumulated on the seafloor in geologically ancient times. Through various geochemical processes this material was converted to mineral oil, or petroleum, and its components, such as kerosene, paraffin waxes, gasoline, diesel and such. These are classified as mineral oils as they do not have an organic origin on human timescales, and are instead derived from underground geologic locations, ranging from rocks, to underground traps, to sands.
Other oily substances can also be found in the environment, the most well-known being asphalt, occurring naturally underground or, where there are leaks, in tar pits.
Petroleum and other mineral oils, (specifically labelled as petrochemicals), have become such a crucial resource to human civilization in modern times they are often referred to by the ubiquitous term of "oil" itself.
source : http://en.wikipedia.org/wiki/Oil

Forex

Forex

Today almost anyone is able to discover how they can be part of currency trading by opening a forex demo account. In just moments you can check your own progress with some practice trades that you are responsible for selecting. The foreign exchange market is a vibrant and thriving community. With this account you will gain experience and confidence while you learn how the forex market actually operates.A forex demo account is available to you with no obligation. This type of account is for you to gain knowledge about the trading process and follow your transactions without any risk. Any forex trader will tell you that practice and in depth study is a big key to your success in this area.You can find a forex demo account quickly by going online and checking out more information about currency trading and forex software programs.

  Whether you are looking for some recreational trading for fun and profit or hoping to make a big score, a forex demo account will provide you with a wealth of valuable experience.A forex demo account will let participants actually explore the many ways that trading of currency is designed. No other marketplace is structured in the way that the foreign exchange venue is. With a forex trade you must be prepared to quickly read the data coming into your computer and be able to calculate any possible trends at the earliest moment. This will allow you to make your trades in time to maximize any profit or gain.. The best practice technique remains in the form of the forex demo accounts which let you get actual trading experience without risking any money of your ow: http://EzineArticles.com/?expert=Melanie_Ullman