Medical Gas Therapy Unit 4.0 - Properties and Characteristics of Oxygen

Two scientists independently discovered oxygen

- Joseph Priestley - Carl Wilhelm Scheele

Characteristics of the oxygen

- denser than air and only slightly soluble in water, - poor conductor of heat and electricity, - supports combustion but does not burn.

Critical Temperature

-118 °C (-181°F)

Boiling Point

-183 °C (-297°F)

Melting / Freezing Point

-218 °C (-361 °F)

when the oxygen was discovered?

1774

molecular weight of Oxygen is

32.

Critical pressure

49.7 atmospheres, = 730.6 PSI = 37,773 mm Hg

The name oxygen was created by

Antoine Lavoisier He incorrectly believed that oxygen was necessary to form all acids.

atomic characteristic of the oxygen

At standard temperature and pressure, oxygen exists as a diatomic molecule with the formula O2, in which the two oxygen atoms are doubly bonded to each other.

Avogadro's number

Avogadro determined that equal volumes of a gas at the same pressure and temperature contain the same number of molecules 6.02 x 1023

temperature above which a gas cannot be converted to a liquid no matter what pressure is exerted on it.

Critical Temperature

Pressure required to convert a gas back to a liquid at its critical temp.

Critical pressure

who is usually given credit for the discovery?

Joseph Priestley

It is required by most living organisms and for most forms of combustion

Oxygen

A major component

Oxygen is also a component of hundreds of thousands of organic compounds. Oxygen is a major component of air, produced by plants during photosynthesis, and is necessary for aerobic respiration in animals.

how we usually obtained liquid O2?

by the fractional distillation of liquid air.

Properties of the oxygen?

colorless, odorless, tasteless gas; it is the first member of group VIa of the periodic table.

Oxygen

highly reactive element capable of combining with most other elements.

When cooled below its boiling point?

oxygen becomes a pale blue liquid; when cooled still further the liquid solidifies, retaining its color.

Oxygen is paramagnetic in

solid, liquid, and gaseous forms.