Breathing gas
A breathing gas is a mixture of gaseous chemical elements and compounds used for respiration. The essential component for any breathing gas is a partial pressure of oxygen of between roughly 0.16 and ...
Breathing gas - Wikipedia
Earth's Atmospheric Oxygen Levels Continue Long Slide
Atmospheric oxygen levels have declined over the past 1 million years, although not nearly enough to trigger any major problems for life on Earth, a new study finds.
'Wonder material' sucks oxygen out of room and could help us breathe UNDERWATER
Researchers in Denmark have developed a 'wonder material' that absorbs and stores huge amounts of oxygen. Using cobalt as the main ingredient, researchers from University of Southern Denmark cooked up...
Variations In Atmospheric Oxygen Levels Shaped Earth’s Climate Through The Ages
Variations in the amount of oxygen in Earth's atmosphere significantly altered global climate throughout the planet's history. Efforts to reconstruct past climates must include this previously overloo...
Why there is so little breathable oxygen in space
A down-to-Earth experiment solves an astronomical mystery. You breathe it every minute, but there's hardly any molecular oxygen—otherwise known as O2—in space. In 1998, NASA even launched a satellite ...
Oxygen
Our updated Oxygen video features new footage displaying the paramagnetism of liquid oxygen. More chemistry at http://www.periodicvideos.com/ Follow us on Fa...
Earth's Atmospheric Oxygen Levels Continue Long Slide
Atmospheric oxygen levels have declined over the past 1 million years, although not nearly enough to trigger any major problems for life on Earth, a new study finds.
Mitochondrial ROS
Mitochondrial ROS (mtROS or mROS) are reactive oxygen species (ROS) that are produced by mitochondria. Generation of mitochondrial ROS mainly takes place at the electron transport chain located on the...
Mitochondrial ROS - Wikipedia
Oxygen–haemoglobin dissociation curve
The oxygen–hemoglobin dissociation curve plots the proportion of hemoglobin in its saturated form on the vertical axis against the prevailing oxygen tension on the horizontal axis. The oxyhemoglobin d...
Oxygen evolution
Oxygen evolution is the process of generating molecular oxygen through chemical reaction. Mechanisms of oxygen evolution include the oxidation of water during oxygenic photosynthesis, electrolysis of ...
Hydrox (breathing gas)
Hydrox, a gas mixture of hydrogen and oxygen, was used as a breathing gas in very deep diving. It allows divers to descend several hundred metres.Precautions are necessary when using hydrox, since mix...
Oxygen toxicity
Oxygen toxicity is a condition resulting from the harmful effects of breathing molecular oxygen (O2) at elevated partial pressures. It is also known as oxygen toxicity syndrome, oxygen intoxication, a...
Oxygen toxicity - Wikipedia
AFR sensor
The AFR sensor is an air-fuel ratio sensor that is slowly replacing (or supplementing) the Zirconium oxygen sensor (O2 sensor) in modern motor vehicles.
The early introduction of the oxygen sensor...
AFR sensor - Wikipedia
Membrane method
The Membrane method or mixing by gas separation is a method of gas blending to produce nitrox, a breathing gas mostly used for scuba diving.Nitrox systems use semi-permeable membranes to separate out ...
Oxygen sensor
An oxygen sensor (or lambda sensor) is an electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analysed.It was developed by the Robert Bosch GmbH company during the...
Oxygen sensor - Wikipedia
Bottled gas
Bottled gas is a term used for substances which are gaseous at standard temperature and pressure (STP) and have been compressed and stored in carbon steel, stainless steel, aluminum, or composite bott...
Bottled gas - Wikipedia
Compressed air
Compressed air is air kept under a pressure that is greater than atmospheric pressure. It serves many domestic and industrial purposes.In Europe, 10 percent of all industrial electricity consumption i...
Nitrox
Nitrox refers to any gas mixture composed (excluding trace gases) of nitrogen and oxygen; this includes normal air which is approximately 78% nitrogen, 21% oxygen, and 1% other gases, primarily argon...
Nitrox - Wikipedia
Δ18O
In geochemistry, paleoclimatology and paleoceanography δO or delta-O-18 is a measure of the ratio of stable isotopes O:O (oxygen-18:oxygen-16). It is commonly used as a measure of the temperature of ...
Experiments and Observations on Different Kinds of Air
Experiments and Observations on Different Kinds of Air (1774–86) is a six-volume work published by 18th-century British polymath Joseph Priestley which reports a series of his experiments on "airs" or...
Experiments and Observations on Different Kinds of Air - Wikipedia
Hypoxia-activated prodrugs
Hypoxia-Activated Prodrugs (HAPs) are prodrugs that target regions of tumor hypoxia within tumor cells. HAPs may offer the potential, alone and in combination with conventional chemotherapy, of improv...
Bottled oxygen
Bottled oxygen is oxygen in bottles, such as for high-altitude climbing. Bottled oxygen may be for a breathing gas.When Tenzing and Hillary made the first successful summit of Mount Everest in 1953 th...
Maximum operating depth
In underwater diving activities such as saturation diving, technical diving and nitrox diving, the maximum operating depth (MOD) of a breathing gas is the depth below which the partial pressure of oxy...
Argox
Argox is the informal name for a scuba diving breathing gas consisting of argon and oxygen. Occasionally the term argonox has been used to mean the same mix. The blend may consist of varying fraction...
Hypoxia in fish
Fish are exposed to large oxygen fluctuations in their aquatic environment since the inherent properties of water can result in marked spatial and temporal differences in the concentration of oxygen (...
Hypoxia in fish - Wikipedia
Helium analyzer
A Helium analyzer is an instrument used to identify the presence and concentration of helium in a mixture of gases. In Technical diving where breathing gas mixtures known as Trimix comprising oxygen, ...
Helium analyzer - Wikipedia
Cascade storage system
A cascade storage system is a high pressure gas cylinder system which is used for the refilling of smaller compressed gas cylinders or air cylinders. Each of the large cylinders is filled by a compres...
Cascade storage system - Wikipedia