Various usages of acetylene gas

1. Pharmaceutical industry: used to make contraceptive drugs.
2. Atomic absorption analyzer: used as carrier gas.
3. The important use of dissolved acetylene is metal welding and cutting, spraying, surface quenching and heat processing.
4. The earliest application of acetylene gas is used for lighting, and mainly used for beacon light.

(source:http://www.airseparation-plant.cn/various-usages-of-acetylene-gas/)

Liquid nitrogen usage in industry, biology and medicine

Industrial use:
In industrial production, through the liquid compressed air fractionation method to obtain the liquid nitrogen, can be used as a depth refrigerant, due to its chemical inertness, can directly contact with biological tissue, frozen immediately and won’t destroy biological activity.

1. Quickly freeze and transport food, or make ice products.
2. Study on low temperature physics.
3. Demonstrate low temperature state in science education.Soft objects soak in liquid nitrogen in normal temperature, which can be as brittle as glass.
4. Provide the temperature of superconductivity of high temperature superconductor.
5. Refrigerant can be used to quickly freeze biological tissue to prevent the tissue from being destroyed.
6. Used for industrial nitrogen fertilizer manufacturing.
7. Used for chemical testing, such as BET ratio surface area test method.

Biological and medical uses:

1. Eliminate red imported fire ants.
2. In surgery, quick freezing can be used to help stop the bleeding and remove the superficial layers of the skin.
3. Storage of living tissue, biological samples and sperm eggs.

(source:http://www.airseparation-plant.cn/liquid-nitrogen-usage-in-industry-biology-and-medicine/)

Various usages of Helium in all kinds of industries

Helium widely used military-industrial complex, scientific research, petrochemical, refrigeration, medical, semiconductor, pipeline leak detection, superconducting experiment, metal manufacturing, deep-sea diving, high precision welding, optoelectronic products, etc.
1.Low temperature cold source: using liquid helium low boiling point : 268.9 ℃ , can be used for liquid helium cryogenic cooling. However,cryogenic cooling technology in the field is wildly used ,superconducting technology has a wide application of superconducting materials in low temperature (100 k) shows the superconducting characteristics, in most cases, only liquid helium is easier to achieve such low temperature.Superconducting applies in magnetic train in the transportation industry, and nuclear magnetic resonance (NMR) imaging in the field of medical equipment as well.
2.Balloon inflation: because the helium gas density is far less than the air (air density of 1.29 kg/m3, the density of helium is 0.1786 kg/m3), and the chemical nature very inactive, more hydrogen safety (hydrogen can burn in the air, could cause an explosion), helium is often used in the spaceship or advertising balloons’ filling.
3.Test analysis:nuclear magnetic resonance analyzer is commonly used in instrumental analysis ,the superconducting magnets need to use liquid helium cooling, helium gas of gas chromatographic analysis of often used as a carrier gas, with the characteristic of good helium gas permeability and nonflammable, helium is used in the vacuum leak detection, such as helium mass spectrometer leak detector, etc
4.Shielding gas: with helium inert chemical property and helium as shielding gas often used in metal welding,such as magnesium, zirconium, aluminum, titanium and etc.
6.Other aspects: helium gas can be used as a high vacuum devices, nuclear reactor can be used to conveying liquid hydrogen and liquid oxygen plant for the rocket and the spacecraft , as pressurized gas of liquid propellant. Helium is used as the reactor cleaning agents, breathing in the field of Marine development with mixed gas, the filling gas of gas thermometer and etc.

(source:http://www.airseparation-plant.cn/various-usages-of-helium-in-all-kinds-of-industries/)