The ability to combine nitrous oxide and oxygen at high pressure while remaining in the gaseous form is due to the Poynting effect (after John Henry Poynting, an English physicist). Nitrous oxide, commonly known as " laughing gas," is a Chemical compound with the Chemical formula N 2 O. Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the Pressure (symbol 'p' is the force per unit Area applied to an object in a direction perpendicular to the surface
Entonox is a 50:50 combination of the anesthetic gas nitrous oxide and oxygen. Gas and air redirects here for the 1923 film see Gas and Air (film Entonox, referred to colloquially as gas and air, is an Analgesic Nitrous oxide, commonly known as " laughing gas," is a Chemical compound with the Chemical formula N 2 O. Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the This combination is useful because it can provide a sufficient concentration of nitrous oxide to provide analgesia (pain relief) in sufficient oxygen so that the risk of hypoxemia is eliminated. Hypoxaemia (or hypoxemia is a deficiency in the concentration of dissolved oxygen in Arterial blood This makes it safe to use by para-medical staff such as ambulance officers. However the ability to combine these two gases at the temperature and pressure in the cylinder while remaining in the gaseous form is unexpected based on the known properties of the two gases.
The Poynting effect involves the dissolution of gaseous O2 when bubbled through liquid N2O, with vaporisation of the liquid to form a gaseous O2/N2O mixture.
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