Sentences with phrase «of oxygen in the air»

The problem isn't the percentage of oxygen in the air, which stays relatively constant at about 21 % until about 70,000 feet — it's the lack of air pressure.

But by the late Palaeozoic, land plants had evolved, boosting the level of oxygen in the air to 21 per cent, the level found today.

«This is the first successful use of oxygen in the air to oxidize methane under ambient conditions,» Ohkubo says.

And they found that the amount of oxygen in the air spiked each time smaller land masses collided to form a supercontinent, like Pangea.

Measuring pH lets us monitor the carbon cycle, which underpins the basic chemistry of the ocean and generation of oxygen in the air.

As photosynthetic bacteria prospered and spread, the concentration of oxygen in air and water became abundant as early as Year 2.24 billion (see update from Bekker et al, 2004).

If you consumed all of the oxygen that you breathed in you would expect to find that the amount of oxygen in the air that you breathed out would be 0 %, but it is typically in the 15 % to 18 % range, depending on what you are doing and a number of other factors.

The computer adjusts the amount of fuel going into the engine based on the amount of oxygen in the air registered by the oxygen sensors.

On reaching heights above 3000m, shortness of breath and a pounding heart are a normal response to the lack of oxygen in the air.

The percentage of oxygen in air remains essentially constant with altitude at 21 % up until 70,000 feet (21,330 m), but the air pressure (and therefore the number of oxygen molecules) drops as altitude increases — consequently, the available amount of oxygen to sustain mental and physical alertness decreases above 10,000 feet (3,050 m).

Since scientists have been able to take accurate measurements of the amount of oxygen in the air since the early 1990s, the amount of oxygen in the air has fallen slightly, as shown in Figure 3.

Not exact matches

One of the most often - repeated explanations states that a yawn helps draw in large amounts of air to increase blood pressure, heart rate and blood oxygen levels.

Greg — I can use a couple sensors and show you the partial pressure of oxygen, nitrogen, carbon dioxide, etc. in the «air».

We opt to remove the oxygen from the packaging and thereby change the «air» or «atmosphere» surrounding the meat; keeping the meat in a good condition without the use of harmful additives.

Also, this stream of water carries with it an oxygen flow because any continuous movement in a direction moves the air and with it, oxygen.

The present review evaluates the evidence for such a complex system by investigating studies in which interventions such as elevated temperature, altered oxygen content of the air, reduced fuel availability and misinformation about distance covered have resulted in alterations to the pacing strategy.

If the exercise work rate is free to vary, then experimental interventions such as changes in ambient temperature, oxygen content of the inspired air, energy substrate availability or the provision of incorrect distance feedback all alter the power output (pacing strategy), whereas the rate of increase in RPE has been found to be similar between conditions.13 20 21 24 — 26

The pediatric bag holds a D tank of compressed air, regulator, T - piece resuscitator, newborn bag and mask, neonatal blood pressure cuff, Thermo - warmer used in the event of a transport, non-rebreather oxygen mask, oral airways, oxygen tubing, DeLee suction, 8F feeding tube, syringes of all sizes, pulse oximeter, and an umbilical line kit.

During winter when people crack up the heat in the room, the air becomes dry and stuffy due to less circulation of oxygen and the harsh air leads to different sinus and respiratory problems.

One way to see if air has lots of oxygen in it is to look for signs of lichen growing on tree limbs.

In the last few weeks of the pregnancy, the lungs will grow alveoli, or those air sacs that allow the exchange of oxygen, but they are not a lot.

Very high altitudes can cause headaches, dehydration and nausea, due to the reduced amounts of oxygen and moisture in the air.

In the UK, they offer «gas and air» as a form of pain relief, and that would be oxygen and laughing gas.

That is, oxygen tends to fall out of the air as rust and other mineral oxides rather than linger as a gas, so when it exists in abundance, something — photosynthetic life, in Earth's case — must be constantly replenishing it.

And while salt in the air can accelerate corrosion, Ramirez says, it also adds to a protective covering on the statue called a patina, the result of oxygen, carbon dioxide, and other compounds reacting with the copper.

Touching your time machine down on Earth at a random point in the planet's history, roughly nine times out of 10 you would only find single - celled life or algae and would risk suffocation in the oxygen - starved open air.

Dust found in the ice gives a record of what was in the air thousands of years ago, whether from volcanic eruptions or human activity, and the isotopic composition of the hydrogen and oxygen molecules in the snow give a record of the temperature of the earth at the time.

The gamma rays strip electrons from the molecules in the surrounding air, and the resulting free electrons lose energy and readily attach to oxygen molecules to create elevated levels of negatively charged oxygen ions around the radioactive materials.

The researchers kept the animals in chronically thin air that's similar to the oxygen levels people would experience at the peak of Mont Blanc, the tallest mountain in the Alps, which soars nearly 5000 meters above sea level.

The researchers built their history of atmospheric oxygen using measured ratios of oxygen - to - nitrogen found in air trapped in Antarctic ice.

But climate models predict reductions in dissolved oxygen in all oceans as average global air and sea temperatures rise, and this may be the main driver of what is happening there, she says.

If Proxima b proves to have an atmosphere, Loeb and Kreidberg have also proposed using Webb to probe for the infrared signature of ozone in Proxima Centauri's glare as a possible sign that the planet's air is filled with oxygen — something that, on Earth, is mostly produced by life.

The altitude often causes insomnia or loss of appetite, and because there simply isn't enough oxygen in the air, athletes can't use their muscles intensely enough.

The smelter had to build a furnace out of clay in precise dimensions, provide the right amount of oxygen and charcoal, maintain a 1,200 degree (Celsius) heat, connect bellow pipes, blow a fixed amount of air, and add an exact mixture of minerals.

Activated sludge is a process in sewage treatment in which air or oxygen is forced into sewage liquor to develop a biological floc which reduces the organic content of the sewage.

Then, the team placed the snails in an uncrowded beaker containing water with a normal level of calcium and trained the snails to not come up for air — no big deal for pond snails, who can also get oxygen by absorbing it underwater through their skin.

The catalysts in the air cathode aids the electrochemical reaction of the cell with oxygen gas.

To isolate the effects of oxygen concentration, researchers from the University of Colorado compared the rate of SIDS in infants living at high altitudes, where the air is thin, to those living closer to sea level.

During my drive, I kept listening, in vain, for the whine of the air compressor that force - feeds oxygen into the fuel cell to mix with the hydrogen to create electricity.

At 5260 meters, close to the level of the Mount Everest Base Camp in Nepal, the atmosphere holds 53 % as much oxygen as the air at sea level, making it harder to breathe — and to exercise.

The time required by the electrons to lower their energy level is directly related to the concentration of oxygen in the surrounding air.

Our new system can economically make NO from the nitrogen and oxygen in the air using only small amounts of electric power.

This is within the range of vacuum - UV light — so named because while light of that energy can propagate in a vacuum, it is quickly absorbed by oxygen in the air.

He may find clues in the samples of air, water and blood from the crew that were «exported» from Biosphere 2 before the oxygen was turned on last week.

Exposure to low - oxygen air sends EPO levels soaring in normal mice, but these conditions did not induce a rise in the hormone in the animals without HIF - 1α, the researchers report in the 18 April issue of Cell.

Being air - breathing meant they could thrive in the low - oxygen waters of the post-Permian world where fish struggled to survive.

The ratio should also be higher in drier climates, as there the lighter oxygen - 16 diffuses more readily from a tree's leaves into the air, leaving more of the heavier oxygen - 18 behind to be incorporated into wood.

This allowed the carbon to be stored in the seabed instead of being released into the air, and thus less oxygen was needed to react with carbon.

The nano - catalyst filter uses a technology that decomposes elements of cigarette smoke using oxygen radical, which is generated by decomposing ozone in the air on the surface of the manganese - oxide - based nano - catalyst filter.

Zinc - air batteries combine atmospheric oxygen and zinc metal in a liquid alkaline electrolyte to generate electricity with a byproduct of zinc oxide.