On passing direct current through the n and p-type pairs of semiconductor materials, refrigeration by thermoelectric modules is achieved. When the current passes from the n-type to the p-type, cooling occurs. Cooling occurs when the heat is absorbed from the environment. This cooling occurs when electrons move from the p-side to the n-side of
Gases mixture There are four states of matter that are observable in every day of life (Plasma, Liquid, Gas and Solid). Gas is made up of many individual atoms (noble gas and natural gases), element molecule they made from one single type of atom (Oxygen), or a compound of molecules that made from a variety of atoms (carbon dioxide). The word mixture in chemistry means that a type of material that made up of three or more different substances that are mixed but are not combined chemically.
There are three main types of fuel that powers a combustion engine diesel, gas, and propane. The first engine that was made is the gas engine. There are four main processes that a gas engine has to go through in order to run properly. The first is intake, the piston is pulled down into the cylinder by the crankshaft. This is when a car is running the pistons are always moving up and down. The inlet valve opens which lets a mixture of air and fuel into the cylinder. The next process to make a gas
infectious diseases that could harm the recipient of the donated blood. Blood transfusion was first performed in 1492 when Pope Innocent VII drew blood from three young men hoping that blood transfusion could cure him. However, this led the four men to death. Edward E. Lindemann performed the first successful blood transfusion through vein-to-vein using multiple syringes and a cannula to puncture the vein through the skin. Unger made a syringe-valve apparatus for easier blood transfusion
The sun lies at the centre of the solar system, where it is by far the largest object. It holds 99.8 percent mass of the solar system. It is a sphere of hot gases mostly hydrogen and helium with a diameter of 1.39x10^9 m on an average, at a distance of 1.5x10^11 m from earth. The Sun is a G2V star, with G2 indicating its surface temperature