Poynting effect

Poynting effect

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).

Entonox is a 50:50 combination of the anesthetic gas nitrous oxide and oxygen. 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. 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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  • Poynting , John Henry — (1852–1914) British physicist Poynting was born at Monton, near Manchester, and educated at the universities of Manchester and Cambridge (1872–76). He served as professor of physics at Mason Science College (later the University of Birmingham)… …   Scientists

  • Poynting, John Henry — ▪ British physicist born Sept. 9, 1852, Monton, Lancashire, Eng. died March 30, 1914, Birmingham, Warwickshire       British physicist who introduced a theorem that assigns a value to the rate of flow of electromagnetic energy known as the… …   Universalium

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