电化学合成技术(Electrochemical synthesis)

电化学合成技术（Electrochemical synthesis）Refrigeration, cold, cold, extreme cold: reduce the temperature of local space to less than ambient temperature, known as refrigeration. Reduced to 123K is called pu cold, 123k-4.2 K is called deep cold, reduced to 4.2 K, which is called extreme cold.

Dynamic pressure, the use of explosion (nuclear explosion, gunpowder, etc.), such as strong discharge produced by shock wave, in an instant effect on objects at high speed, can make the object interior pressure over dozens of GPa, even thousands of GPa, accompanied by a sudden warming. This high pressure is called dynamic high pressure.

Static pressure: using the external mechanical loading way, by applying load slow gradually extrusion research object or sample, when its smaller, just inside the object or sample of internal high pressure. The high pressure produced is called static pressure because of the slow loading of the outside world (usually not accompanied by the temperature of the object).

Primary pressure measurement: based on the known basic relationship between pressure and other parameters, the corresponding parameters are established to calculate the pressure. Secondary pressure test: the pressure is measured according to the variation of the pressure component.

Vacuum, vacuum, vacuum pump: a given space that is lower than the atmospheric pressure. The degree of vacuum close to vacuum is in the system. A device for producing a vacuum is called a vacuum pump.

Absolute vacuum gauge, relative vacuum gauge: measuring the vacuum measure, the direct measurement of pressure is called an absolute vacuum gauge; The measurement of the physical quantity relating to the pressure, its pressure scale needs to be calibrated with an absolute vacuum gauge, called a relative vacuum gauge.

Illustrate manometry and secondary manometry answer: primary manometry: mercury manometer and free piston meter is according to the relation between p = F/a measurement function in the area of a force F, the two primary stress of pressure p.

What are the criteria for dividing a vacuum? Answer: low vacuum, medium vacuum high vacuum, high vacuum, high vacuum, high vacuum

The operating characteristics of the vacuum pump are usually characterized by the following parameters:

A limit pressure: the minimum pressure that can be reached at the entrance of the pump after a long period of pumping without gas escaping into the pump.

B pumping rate: the volume of gas flowing through the air inlet section of the pump at a certain pressure.

C maximum inlet pressure: the pressure of the pump before starting to work.

D maximum pressure: the maximum pressure that the pump outlet can withstand without damaging the vacuum pump.

E vacuum production rate: the quality of the gas discharged by the pump in a unit time.

F compression ratio: the ratio of the outlet pressure of the vacuum pump to its inlet pressure.