Notebookerrs Blog

How we quench thirst We feel thirsty we drink water that's simple. But what happens in the biology of our body? Let's have a look Why we feel thirsty? There have receptors in our blood vessels to measure the salt content in the blood. When water level in our body gets low the salt density gets high and the receptors send signal to the brain that we need to drink water, this feeling is what we call Thirst. But interesting thing is when we are very thirsty if we sip water slowly or have a piece of watermelon ( which is 90% water ) we don't feel satisfied. The Thirst is quenched only when we gulp water, even if we consume the same amount of water if sipped. So why we gulp? According to a researchers group from California Institute of Technology, this works in a cycle called Thirst Circuit. There is a part in brain MnPO (Median preoptic nucleus) which, with the help of other parts of the Brain named SFO & OVLT does the work. It takes...

Street Lamps Street lights are bright yellow in color most of places, the reason behind this is the type of lamps used in streets, Sodium Vapour Lamps How Sodium Vapour Lamps work Sodium Vapour lamps are made of a glass tube filled with inert gas like helium and argon and a small amount of sodium. Two electrodes are placed on the ends of the tube. When a voltage is applied across the electrodes, the inert gas inside the tube ionizes and current starts flowing through it. It creates a pinkish red glow. Because of the flow of current the temperature increases and this caused the sodium to vaporise. The sodium vapor then stabilizes the electric arc and sodium vapor creates a monochromatic yellow light. Advantages & Use Human eyes can detect light from wavelength 390 - 700 nm , and sodium vapor generates light of around 600nm wavelength which is quite useful zone of visibility. That means most of the energy coming out this lamps is in the form of visible light...