Aluminum Welding Health Hazards

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The effects of helium in our voice

Helium is a colorless, odorless and a href = ""> noble gases at room temperature, is listed in the periodic table Group 18. It is the second most abundant element in the universe. The name comes from the Greek word Helios, meaning "Sun." The gas was isolated from terrestrial sources in 1895. Helium is lighter than all but a gas. Helium, like other noble gases, it is almost chemically inert. The shell is filled with an electron, which makes possible reactions with other elements extremely difficult and the resulting compounds quite unstable. However, under extreme pressure from the chemical reactions can occur. The molecules of compounds with other noble gases, and hydrogen are detected, however, and other compounds have been proposed as a combination of hydrogen and helium-iron ..

Helium is the most difficult of all gases to liquefy and is impossible to solidify at atmospheric pressure. These properties of liquid helium is extremely useful as a refrigerant and for experimental work in the production and measuring very low temperatures. Liquid helium can be cooled to near absolute zero at normal pressure of the rapid removal of vapor above the liquid. At a temperature slightly above absolute zero, it becomes a phase called helium II, also called superfluid helium, a liquid with unique physical properties. No freezing, and its viscosity is apparently zero is easily passed through the tiny pores and cracks and flow, even on the sides and on the edge of a container. Helium-3, the mass of light isotope of helium 3, which has an even lower than the boiling point of helium usually have very different properties when liquefied. Some experiments show that helium at extremely low temperatures solid has unusual properties due to what is called super strength. The scientists investigate the existence of super strength. solid helium becomes stiffer in a super strong, but also shows the characteristics of a possible "perpetual flow" similar to superfluidity.

Helium is also responsible for 25 percent of the mass the universe, compared to about 73 percent hydrogen. heavier elements represent the remaining quantities. More than helium in the universe was created about 13.7 billion years, shortly after the event that started the universe. Helium is rare on Earth, located mainly mixed with natural gas trapped in pockets underground. Once the helium is released, it's so light that escapes into the atmosphere in space and can not be recovered. At sea level, Helium is produced in the atmosphere to 5.4 parts per million. The figure rises slightly in height. About 1 part per million of atmospheric helium consists of helium-3 now regarded as a product of the disintegration of the radioactive isotope of hydrogen of mass 3. The common helium isotope helium-4, probably comes from issuers alpha radioactive rocks. Natural gas, which contains an average of 0.4 percent helium, is the primary commercial source of helium. By far the largest users of helium are agencies United States government.

Because it is noncombustible, helium is preferred to hydrogen as a lifting gas in balloons over lighter than air and has 92 percent of the lifting power of hydrogen, but weighs twice. Helium is used to pressurize and stiffen the structure of rockets before takeoff pressurized tanks and liquid hydrogen or other fuels to power fuel rocket motors. It is useful for this application because it is a gas, including low temperature of liquid hydrogen. Can use helium is also a heat transfer medium in nuclear reactors because it remains chemically inert and non-radioactive under the conditions existing reactors.

The liquid helium coolant is important to achieve extremely low temperatures necessary for the State when electric currents flow with virtually no resistance. Helium is used in the synthetic atmosphere breathed by underwater divers, workers in drawer and others, as it reduces the health problems of divers. This atmosphere of synthesis is also used in medicine to relieve sufferers of respiratory difficulties because helium moves more easily than nitrogen through constricted airways. Ionized helium beams from sources synchrocyclotron test useful in the treatment of eye tumors, by stabilizing or even declining tumors. These beams are also used to reduce vessel malformations blood in the brain of patients. Helium is used in the arc under inert gas in welding of light metals such as aluminum and magnesium alloys, which would otherwise oxidize; helium heated rooms protects the air strikes. Helium transporting small quantities of gas, compressed in steel cylinders and heavy. Larger quantities can be sent helium as a liquid in insulated containers, transport and save. Helium is a non-renewable resource and can be created artificially, in any practical way. The gas is important for many types of scientific research and may be essential to future advanced technologies.

A relevant question is often raised in connection helium side effects when aiming at a balloon. It has been said that helium is a hole in our brains, which eliminates brain cells and brain cells can be replaced right. As we know helium is an inert gas as can be. In fact, helium no holes in the brain or kill brain cells. The only health problem we can find the inhalation of helium is a deprivation of oxygen, which can be very serious. This will only happen if the helium displaces all the oxygen in the lungs. Until we breathe in helium only, is, if we take a few breaths of air after the expiry of helium, there should be no problem.

Inhaling helium can cause our voice to change more than one eighth of its normal pace. To inhale helium from a balloon that just have to breathe the helium outside and breathe in. After that spoke. We are surprised that our voice tone of a mouse instead smiling. The speed (pitch and elsewhere) of sound varies with the molecular weight of gas breathe in. molecular weight of air dry 0 ° C is about 28.964, while helium is about 4.003 at the same temperature. The speed of sound in dry air (0 ° C again) is about 331.3 m / s, while in helium the speed of sound is 891.2 m / s. Therefore, the sound frequency in helium is almost 2.7 times higher than the sound in dry air. This makes the change in voice an octave. Therefore, something we should be aware of inhaled helium before attempting the risk. Since our body uses when you inhale helium, we are essentially holding our breath the whole time, so it must be remembered that one breathes helium not take long for someone to loose consciousness due to suffocation. However, on rare occasions, people really dead after inhaling helium.

What is important is that we do not inhale helium from a cartridge. In a helium balloon is approximately the same pressure as the atmosphere, so when we breathe the breath, not seek to develop have much more space. The helium from a cartridge is under high pressure. As is released into the atmosphere low pressure helium gas to grow quickly. A ball can consider this as it is designed to develop, but our lungs can not, and break, leaving the sick. Helium is used to filled balloons is specially blended to contain some oxygen with helium. This makes it less dangerous than helium, but not completely safe either way. We must consider the consequences before inhaling helium. Although it seems unlikely that anything will happen but can not say that inhaling helium is safe.