07
2025-01
Safety knowledge on the use of oxygen
Under normal pressure, when the concentration of oxygen exceeds 40%, oxygen poisoning may occur. When inhaling 40% -60% oxygen, discomfort and mild cough may occur behind the sternum, leading to chest tightness, burning sensation behind the sternum, and difficulty breathing. Coughing may worsen, and in severe cases, pulmonary edema and even respiratory distress syndrome may occur. When the inhaled oxygen concentration is above 80%, facial muscle twitching, pale complexion, dizziness, tachycardia, and collapse occur, followed by systemic tonic convulsions, coma, respiratory failure, and death.
2025-01-07
07
2025-01
The properties and uses of helium gas
The industrial application of helium utilizes its low boiling point of -268.9 ℃, and liquid helium can be used for ultra-low temperature cooling. Helium is indispensable in the widely studied applications of superconductors in fields such as maglev trains. In addition, due to its inert chemical properties and lighter weight than air, helium is commonly used as a filling gas in spacecraft or advertising balloons, and this use is also well-known. Helium is widely used in mixed gases for respiration in the field of ocean development, as well as in the cooling of superconducting electromagnets in magnetic resonance imaging equipment in the medical field.
2025-01-07
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