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Some shallow divers, particularly naval combat divers, use oxygen rebreathers, and they use a small oxygen cylinder to provide the gas. [ citation needed ] Oxygen is rarely held at pressures higher than 20 megapascals (3,000 psi), due to the risks of fire triggered by high temperatures caused by adiabatic heating when the gas changes pressure ...
heat capacity c P J⋅g −1 ⋅K −1 Molar heat capacity, C P,m and C V,m J⋅mol −1 ⋅K −1 Isobaric volumetric heat capacity C P,v J⋅cm −3 ⋅K −1 Isochoric molar by atom heat capacity C V,am mol-atom −1; Isobaric Isochoric Air (Sea level, dry, 0 °C (273.15 K)) gas: 1.0035: 29.07: 20.7643: 0.001297: Air (typical room conditions ...
O 2, O 3 and more (see Allotropes of oxygen) Appearance: gas: colorless ... heat capacity 2 ref = | heat capacity 2 comment = | vapor pressure 1 ... standard atomic ...
An open circuit SCBA typically has three main components: a high-pressure gas storage cylinder, (e.g., 2,216 to 5,500 psi (15,280 to 37,920 kPa), about 150 to 374 atmospheres), a pressure regulator, and a respiratory interface, which may be a mouthpiece, half mask or full-face mask, assembled and mounted on a framed carrying harness.
A small steel tank of 16 litres water capacity with a working pressure of 139 bar (2015 psi), holds about 2150 litres of gas and weighs 28 kilograms (62 lb). [ 3 ] 2150 litres of oxygen, without the steel tank, weighs about 3 kilograms (6.6 lb)
The heat content of an ideal gas is independent of pressure (or volume), but the heat content of real gases varies with pressure, hence the need to define the state for the gas (real or ideal) and the pressure. Note that for some thermodynamic databases such as for steam, the reference temperature is 273.15 K (0 °C).
Bottled oxygen, more broadly known as high pressure compressed oxygen, medical oxygen, and aviator's oxygen, is oxygen in small, portable, high-pressure storage cylinders. For aviation, the weight of the cylinder is usually not critical, and the choice of material may be affected by economic considerations such as purchase price and useful ...
To achieve the same increase in temperature, more heat energy is needed for a gram of that substance than for a gram of a monatomic gas. Thus, the specific heat capacity per mole of a polyatomic gas depends both on the molecular mass and the number of degrees of freedom of the molecules. [25] [26] [27]