There are two quantities that describe any given magnetic field: Magnetic induction, B and Magnetic intensity, H In the cgs (centimeter, gram, second) system of units B equals H, but in the international SI system they are identical up to a constant. In the international SI system magnetic induction is measured in Tesla (T)...
Science
Magnetism: What is The Spontaneous Magnetization of Iron, Cobal and Nickel?
The spontaneous magnetization is the total magnetization that exists inside a microscopic volume of material when there is no magnetic field present. It depends on the temperature among other factors. The spontaneous magnetization of iron, Fe, at room temperature (RT) is 1 720 000 A/m. The spontaneous magnetization of cobalt, Co, at RT is...
Magnetism: What is Earth’s Magnetic Field Value
Earth’s magnetic field is 50 A/m, which is a very low value as compared to the common macroscopic magnets. This is an equivalent of about 50 µT (micro Tesla) or 0.5 Gauss. Earth’s magnetic moment, however, is large – 8∙1022 Am2. The Earth’s magnetic field value can be compared to the values other celestial objects....
Magnetism: What is Magnetization?
Magnetization, M, is magnetic dipole moment per unit volume of material. It is measured in amperes per meter A/m. A lot of magnetic materials have spontaneous magnetization. Check the values of spontaneous magnetization of iron, cobalt and nickel.
What is Smaller Time Unit Than a Femtosecond
Time units can be confusing. You might know what nanosecond is, as this unit corresponds to some time processes in various electronic devices. If you are a scientist, engineer or technician you should be able to identify the smallest time units, some of which are even smaller than femtosecond. Let us see first what...
Diamond and graphite
So by combining carbon atoms we get both diamond and graphite, (not to mention coal which we use for producing heat in our power plants). But why are they so different? You may all know that diamond is one of the hardest minerals on Earth. On the Mohs scale of mineral hardness – scale...
Solar Radiation
the intensity of Solar radiation as a function of wavelength is presented. The yellow part represents the intensity of Sunlight at the top of the atmosphere, while the red part is the same Sunlight intensity measured at Sea Level. We see that the Sea Level radiation does not match the radiation at the top...
The Basic Physical Processes in a Solar Cell
Every solar cell is based on a very fundamental physical principle which involves interaction between light and electrons. The light (or photons – small packages of light energy) is of course coming from the Sun, and the electrons are present in the material out of which the solar cell is built. The photons come...
Platinum vs. Gold – How much is Platinum more Expensive than Gold?
The name platinum comes from the Spanish word platina which means “little silver”, obviously referring to its shine and appearance. The modern history of platinum starts in the 18th century. The scientists of the medieval times, the alchemists, knew and recognized as metals seven elements: gold, silver, mercury, tin, iron, copper, and lead. There...
Shaking-up the Laws of Nature
They should be drawn to each other quite strongly! So, on one hand we have the gravity that would eventually cause the Universe to contract into itself. On the other hand we supposedly have this “dark energy” which appears to be pushing apart the galaxies faster than the gravity can pull them together. There...