why do they put oxygen masks on planes

why do they put oxygen masks on planes

Most that operate at high flight altitudes are pressurized at a maximum cabin altitude of approximately 8,000 feet. On most pressurized aircraft, if cabin pressurization is lost when the cabin altitude is above 14,000 feet, compartments containing the oxygen masks will open automatically, either above or in front of the passenger and crew seats, and the oxygen masks will drop down in front of the passenger. Oxygen masks may also drop on extremely rough landings or during severe turbulence if the oxygen mask panel becomes loose. Rows of seats typically have an extra mask (i. e. 3 seats, 4 masks), in case someone has an infant in their lap, or someone in the aisle needs to grab one. An oxygen mask consists of a yellow, soft, silicone facial cup with white elastic bands for securing the mask

 why is the tribe of dan not mentioned in revelation

why is the tribe of dan not mentioned in revelation

Many, including myself, have been perplexed by the apparent omission of the tribe of Dan from the list of "all" the tribes of Israel in. This has led to much speculation in an attempt to explain this strange occurrence. A possible explanation alluded to in the Pulpit Commentary is that Dan was omitted due to a scribal error. Looking at the list it's difficult to understand why the tribes of Dan and Ephraim are omitted in place of Levi, Joseph and Manasseh especially when we note the following: The apostle John states those sealed were from "all the tribes of the children of Israel" ( ). The Greek word оААо ( huios Strongs 5207 ) translated as "children" literally means "a son. " Accordingly in Young's Literal Translation this verse is rendered: "And I heard the number of those sealed,

 why was the capture of fort ticonderoga important

why was the capture of fort ticonderoga important

Also in 1776, a fleet of small warships under the command of Benedict Arnold fought the Battle of Valcour Island on Lake Champlain. In July 1777, Fort Ticonderoga changed hands again, after British General John Burgoyne managed to place a cannon on Mount Defiance and force Ticonderogaвs garrison under General Arthur St. Clair to evacuate. The Redcoats finally abandoned the fort permanently that November, following Burgoyneвs surrender at Saratoga. In the years following the Revolutionary War, no military regiment would occupy Fort Ticonderoga, though at times the fort provided shelter for scouting parties or raiding detachments. In 1816, a merchant named William F. Pell began leasing the grounds of the fort. He bought the property in 1820, building a summer home there known as The

 why do we have phases of the moon

why do we have phases of the moon

For millennia, humans have kept track of time by observing the changing face of the moon. In fact, you may have noticed that the word moon shares its first few letters with the word month and that s no coincidence. The phases of the moon new moon, first quarter, full moon and last quarter repeat themselves about once every month. But why does the moon have phases at all? To answer this question, it s necessary to understand two important facts. First of all, the moon revolves around the Earth once every 29. 5 days. And secondly, as the moon carries out its voyage around the planet, it s lit from varying angles by the sun. One half of the moon is always illuminated by the sun. But here on Earth, we can t always see the half of the moon that s lit up. What we call the phases of the moon

 why do some solids dissolve in water

why do some solids dissolve in water

As with every process, dissolving can be described by the Which the process being spontaneous if $Delta G$ is negative. We have two components here, enthalpic and entropic. The enthalpic component $Delta H$ is a constant of the salt in question. The entropic component $Delta S$ can usually be considered positive because a highly ordered crystal lattice is broken to give dissolved, much less ordered fragments Б hence why for most salts they dissolve easier in hot water. If the solubility decreases with higher temperatures, then $Delta S$ must be negative. The salt will then only dissolve if $Delta H$ is negative enough to give an overall negative result. This seems to be the case for $ce{Na2SO4}$ It is impossible to predict $Delta S$ and $Delta H$ a priori without any computer quantum

 why should we hire you interview question answer

why should we hire you interview question answer

Why should we hire you belongs to the most typical interview questions. When you apply for a bank teller job, employers have a good reason to ask the question. P There are dozens if not hundreds of applicants for teller jobs, and it is difficult to pick the best one only. You will need a good and original answer to stand out. Most people do a mistake, using a general answer to this question. I have heard the following answers way too many times in the interviews: You should hire me becasue I am the best person for this job. I really need this job. You should hire me, because I am better than the others. The only thing the interviewers in a bank learn from such an answer is that the job applicant has no idea about the value they can bring to the bank. What is more, to say that you are

 why was the railroad important to the american industrial revolution

why was the railroad important to the american industrial revolution

The rail industry helped to shape America into what is today, and it continues to carry our nation into the future. Without railroads, the world would be an altogether different place. From fueling the industrial revolution to actually shaping the physical landscape, trains have left an indelible mark on the world and the United States in particular. Taking a look at historical trends since the birth of the steam locomotive, it is impossible to overstate the industryвs importance today. Arguably no other technological innovation or form of transportation has had an impact as large as the railroad. The economic, social, and cultural doors that were opened by trains transformed the world, connecting towns and cutting through mountains. While railroads were a product of the industrial

 why was there a ring around the moon last night

why was there a ring around the moon last night

We get many messages throughout each year from people whoБve just spotted a large ring or circle of light around the sun or moon. Scientists call them 22-degree halos. People just want to know, what causes these gigantic rings? Follow the links below to learn more about lunar and solar halos. What makes a halo around the sun or moon? ThereБs an old weather saying: ring around the moon means rain soon. ThereБs truth to this saying, because high cirrus clouds often come before a storm. Notice in these photos that the sky looks fairly clear. After all, you can see the sun or moon. And yet halos are a sign of high thin cirrus clouds drifting 20,000 feet or more above our heads. These clouds contain millions of tiny ice crystals. The halos you see are caused by both refraction, or splitting

 why were the pyramids built in ancient egypt

why were the pyramids built in ancient egypt

No pyramids are more celebrated than the Great Pyramids of Giza, located on a plateau on the west bank of the Nile River, on the outskirts of modern-day Cairo. The oldest and largest of the three pyramids at Giza, known as the Great Pyramid, is the only surviving structure out of the famed seven wonders of the ancient world. It was built for Khufu (Cheops, in Greek), SneferuБs successor and the second of the eight kings of the fourth dynasty. Though Khufu reigned for 23 years (2589-2566 B. C. ), relatively little is known of his reign beyond the grandeur of his pyramid. The sides of the pyramidБs base average 755. 75 feet (230 meters), and its original height was 481. 4 feet (147 meters), making it the largest pyramid in the world. Three small pyramids built for KhufuБs queens are lined

 why should you answer phone with left ear

why should you answer phone with left ear

A message from the Apollo medical team says that we should always use our left ear for calls because using the right ear can directly affect the brain. A later version of the message says that when using the right ear for mobile phone calls makes the brain more prone to mobile radiation. However, there are no evidences that prove that using the left ear can lower these risks. This information was firstly published in 2002. It summarizes the findings of a study conducted by scientists at Finlandвs and Nuclear Safety Authority. These scientists found that exposing human cells to mobile phone radiation damages the blood-brain barrier, which is a safety barrier in the body that blocks dangerous substances in blood from penetrating the brain. This report makes clear that the conducted research

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