Ambulances carry oxygen cylinders because it is often used to revive people, e.g. For people rescued from drowning or people rescued from smoke filled rooms.
Hospitals also use it for patients with breathing difficulties e.g. Asthma.
It is at sea level. The higher you climb from sea level, to reach the summit of Mount Everest (for example), the less oxygen is in the very thin air. This is why the majority of climbers of Mount Everest have to carry oxygen cylinders. Someone occasionally achieves the summit without oxygen tanks! Therefore, the higher the altitude, the thinner the oxygen in the air.
Pure Oxygen is stored either as a gas in high pressure gas cylinders or as a liquid in large cryogenic tanks. Highly Flammable. :)
concave disks
Green plants, as they carry out photosynthesis, are constantly releasing oxygen into the atmosphere.
Yes, oxygen is portable. Though major technicalities play into this, oxygen is technically portable.Although we cannot grasp and carry oxygen with our bare hands to somewhere, you can get oxygen tanks, which make oxygen portable. Oxygen tanks are used for diving and the related, and are made to be portable.
Because they find themselves in environments of little or no oxygen, and oxygen is essential to life.
So that they may breath underwater.
Yes, it is considered a first line treatment for many emergency situations. Even Emergency Medical Technicians (EMT) can administer this drug. Oxygen is considered a drug.
A climber carries an oxygen cylinder on their back because it helps him/her to breathe easier. On high altitude mountains like Mount Everest the air is so thin it makes it very hard for anyone to breathe without extra oxygen from a cylinder.
If you mean 'Why do climbers carry oxygen cylinders on mountains' then that is to survive. On high mountains like Mount Everest the air (oxygen) is so thin you need help to breathe, so they use oxygen from a cylinder.
Because at great heights ie up mountains the air becomes 'thinner' this means there is less oxygen and so it is harder to breathe. So they carry the oxygen so that they can continue up the mountain otherwise they will be unable to coninue because it is dangerous.
For long-distance transports
At extreme altitudes, the air becomes rarefied and has a very low oxygen concentration. This can lead to a condition known as hypoxia, which is deprivation of oxygen to the brain, which can cause loss of consciousness, paralysis, and death.
They have to carry oxygen cylinders with them as it allows them to breath at high altitude. The temperature also decreases as we go higher and higher.
The higher you go up away from the Earth's surface, the less oxygen can be found in the air and more of gases we don't need to breathe in. So, as the mountaineer goes higher up, breathing becomes harder and your body works slowly, reducing reaction times. By carrying an oxygen tank, the mountaineer can always be breathing the perfect concentration of oxygen they need at all times.
some carry and some may not carry
You can buy oxygen cylinders online at http://www.trishir.com/products-details.asp?POID=251 They offer many cylinders of small,medium portable cylinders You can buy small oxygen cylinders at www.oxygenmobility.com For more details call 800-716-6674.