ScienceIQ.com

The World's Largest Clone

What's the world's largest clone? It's not a sheep, but an aspen tree...and it's a natural clone, not a human-engineered one. Nicknamed 'Pando' (Latin for 'I spread'), this 'stand' of 47,000 aspens in Utah is actually a single tree. It weighs six million kilograms (13 million pounds)--making it not only the world's largest clone, but also the ...

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WorldsLargestClone
Chemistry

Table Salt - It's All In The Ions

All elements are defined by their individual atoms, which are in turn identified by the number of protons in the nucleus of each atom. Since protons are carriers of positive electrical charge, there ... Continue reading

TableSaltItsAllInTheIons
Engineering

A New Twist on Fiber Optics

By twisting fiber optic strands into helical shapes, researchers have created unique structures that can precisely filter, polarize or scatter light. Compatible with standard fiber optic lines, these ... Continue reading

ANewTwistonFiberOptics
Medicine

Is Heartburn a Heart Burn?

Heartburn is a bad name for a complaint that has nothing to do with the heart. TV ads call it acid indigestion. It's a burning sensation that begins under the breastbone and moves up into the throat. ... Continue reading

IsHeartburnaHeartBurn
Astronomy

What Is Polarimetry?

Polarimetry is the technique of measuring the 'polarization' of light. Most of the light we encounter every day is a chaotic mixture of light waves vibrating in all directions. Such a combination is ... Continue reading

WhatIsPolarimetry

Airbags

AirbagsAn automobile airbag is a safety device: its sole purpose is to prevent an occupant of the vehicle from impacting with the surrounding structure. Typically, in a collision, Newton's laws of motion tend to be obeyed very well. Of particular concern is the law of inertia, which says that objects in motion tend to stay in motion unless acted upon by an external force. A person traveling in a car, even though still inside the car, is nevertheless traveling at the same speed as the car. If the car stops suddenly, the person tends to keep moving with the same direction and speed as before the collision. Seat belts go a long way to prevent such collisions, by effectively making the person a physical part of the car, so that he or she stops when the rest of the car stops. But seatbelts have not proven entirely effective. Small children may not even be restrained at all by a normal seatbelt. The airbag was designed to provide a protective cushion against such potentially deadly impacts.

In application, there are a number of serious considerations for airbags. The material from which they are made, and their construction, must be strong enough to withstand the pressures generated on impact; the structure must maintain its integrity at all times; and it must itself function both reliably and safely. In its construction, an automobile safety airbag restraint is nothing more than a type of balloon attached to a canister of compressed gas through a valve. An impact sensor opens the valve, releasing the gas into the airbag. The gas pressure is so high that the airbag inflates almost instantaneously, knocking away any protective covers in the process. A pressure relief valve vents excess gas to prevent the bag from rupturing. This maintains a secure impact-absorbing cushion between a person and the vehicle. The effect is rather like throwing a big pillow under someone when they fall so that they hit against something cushioning rather than the hard floor.

Are airbags foolproof? Not at all. As with any mechanical device, there is always a possibility of failure that depends very highly on regular monitoring and maintenance of the system. In a collision, it is also possible that the airbag is damaged so that it can not function. In addition to this, the sudden eruption of an airbag in front of one's face can be likened to having a small bomb go off there. The force of the airbag expansion has been known to blast pieces of the protective coverings away like so much shrapnel. Injuries and deaths have occurred precisely because of this effect, most notably with very small children and infants, whose tiny, delicate bodies are so easily compromised. It is therefore vitally important that proper attention is given to how child and infant car seats are placed in a vehicle. Never place them in the front seat with the little one facing forward, and whenever possible put them in the rear seat.