A Strobe is a light or lamp that flashes regularly and can make moving objects look like they’re not moving or like they’re moving very slowly. If the object you’re looking at using a Strobe is moving at the same frequency as the Strobe is flashing, the object appears completely motionless. The Stroboscopic Effect is a visual phenomenon caused by aliasing that occurs when continuous motion is represented… Read more →
A carbon footprint is defined as: The total amount of greenhouse gases produced to, directly and indirectly, support human activities, usually expressed in equivalent tons of carbon dioxide (CO2). Typically, a carbon footprint is calculated by estimating not just the CO2 emissions that the activity in question causes, but also any emissions of other greenhouse gases (such as methane and nitrous oxide)… Read more →
Ripening is a process in fruits that causes them to become more palatable. In general, the fruit becomes sweeter, less green (typically “redder”), and softer as it ripens. Ripening agents accelerate ripening. An important ripening agent is an ethylene, a gaseous hormone produced by many plants. Many synthetic analogues of ethylene are available They allow many fruits to be picked prior to full ripening, which… Read more →
Soundproof glass works by creating a near-impenetrable barrier between the sound and your ears. It takes on the mechanical energy of the sound wave and captures it. Such material can block between 90 to 95% of most sounds, with only a few frequencies as an exception. To block any noise, you need to fulfill five principles of soundproofing. These are:… Read more →
Hot air is less dense than cold air. When you light a candle, the air near the wick gets hotter and ( being less dense) gets pushed up by heavier and denser cold air(being heaver cold air is pulled down to earth). Flame of a candle is actually burning wax vapors. When the hot air rises, wax vapors also rises(because… Read more →
Seismometer A seismometer is a device that is sensitive to vibrations. It works on the principle of a pendulum: a heavy, inert mass with a certain resistance to movement (i.e. inertia) due to its weight is suspended from a frame by a spring that allows movement. The energy from any seismic activity excites this “proof mass” as it is called… Read more →
Spiders produce silk threads to build their webs. The silk is produced in silk glands with the help of the spider’s spinnerets. Spinnerets are special organs that allow the spider to decide what type of thread it needs for the web. The silk threads can be thick or thin, dry or sticky, beaded or smooth. The threads a spider uses… Read more →
There’s a sweet spot above the Earth where a satellite can match the same rotation of the Earth. This special position in high Earth orbit is known as a geosynchronous orbit. About 35,786 kilometers above the Earth’s surface, satellites are in geostationary orbit. From the center of the Earth, this is approximately 42,164 kilometers. This distance puts it in the high Earth… Read more →
Closed ecological systems (CES) are ecosystems that do not rely on matter exchange with any part outside the system. The term is most often used to describe small manmade ecosystems. Such systems are scientifically interesting and can potentially serve as a life support system during space flights, in space stations or space habitats. In a closed ecological system, any waste… Read more →
Hard disk drives require a certain range of air pressures in order to operate properly. The connection to the external environment and pressure occurs through a small hole in the enclosure (about 0.5 mm in breadth), usually with a filter on the inside (the breather filter). If the air pressure is too low, then there is not enough lift for… Read more →
