Boat.Certainly, they can't catch fire an explosion.But, misery of BE, in the world the biggest Hai spirit dirigible airship but successively meet storm but crash.But the airplane more and more develop, the dirigible airship gradually disappeared completely in the sky.
Today, in the sky if suddenly fly to come to a big dirigible airship, will definitely arouse everyone's astonishment.But don't think that the dirigible airship has already completely withdrawn history satge.
Is already the ages that the supersonic speed flies now, who still need to use that greatly and stupid and slow of dirigible airship?But not ability see speed rate of speed, this aspect.Airplane although being quick,carry quantity is small, expend fuel much;Dirigible airship although being slow,carry to have great capacity, expending fuel is little.Someone once computes and transported goods to want with the dirigible airship cheaper than airplane 67 times.
The airplane wants to take off landings on the airport.The dirigible airship doesn't need to grow long runway, it can perpendicular take-off, pancake landing, necessity of time can also for a long time stop in mid air motionless.Investigate for geology to explore a brigade and climb mountain brigade carrying to investigate to explore equipments, scientific instrument and life data, the dirigible airship is a very ideal conveyance tool.While exploring in southern North Pole, a big dirigible airship that exclusively designs lands on the ice noodles, can become the ideal headquarter of errant brigade.
A big dirigible airship can mourn to carry several 10 tons with to several 100 tons of things, this can also have a special function in constucting industry.The tower of petroleum artesian well, the dirigible airship can fair and softly lift and carry a new artesian well location.To once wear a high mountain canyon to install high pressure power line the dirigible airship can commit suicide by hanging to pack an iron pagoda of line in the hilltop, and can fly a canyon to more build high pressure electric wire.The dirigible airship is air to rise heavy work.
Is positive in order to having this many functions of superiorities, many nations are all designing the new dirigible airship of the spirit of Chong Hai currently."Devote major efforts absolute being" dirigible airship of design in France, the diameter contains 235 meters, the physical volume has 1,500,000 to sign square rice, can load 900 ton goods.Anticipate in the near future, the dirigible airship will return the sky again.
Liquid Hai
At the beginning of this century of several 10-year in, the international communities are looking for a Hai spirit resources, at that time mainly for the sake of the Chong dirigible airship.But arrived today, Hai not only use flight up, the frontier of science studies and modernizes an industrial technique and all cans not gets away from Hai, and use of usually is the Hai of liquid, not gaseous Hai.The liquid Hai leads people to a new realm-low temperature world.
Before have been already spoken that pulling a Mu match is up in the air to seek the story of Hai spirit.Under the temperature of liquid air, Hai and Nai still keep aring air;Under the liquid hydrogen temperature, the Nai became solid, but the Hai still keep being air.
To is cold to arrive what extent would the Hai become liquid?
Before have been already said, the British physicist Du tile gets first in 1898 beginning of years liquid hydrogen.At same years, the physicist card of Holland beautiful wood& amp;#183;The Ao Nie Si also got liquid hydrogen.The liquid hydrogen boiling point is below zero 253 Celsius degreeses, under this low temperature, other various air not only became liquid, but also all became solid.Only the Hai is the air that the last isn't willing to become liquid.Card beautiful wood& amp;#183;The Ao Nie Si decision becomes Hai spirit the liquid is also.
In July, 1908, card beautiful wood& amp;#183;The Ao Nie Si succeeded, the Hai spirit became liquid.He got the liquid Hai of 320 cubic centre-metre rices for the first time.
Being good to arrive is liquid hydrogen, have to compress hydrogen first and cool off the temperature of liquid air, then let it inflates and makes the temperature descend further, the hydrogen became liquid.
The Hai that is good to arrive liquid, have to shrink Hai air pressure first and cool off liquid hydrogen temperature, then let it inflates and makes the temperature descend further, then the Hai spirit can become liquid.
The liquid Hai is the liquid of transparent easy fluxion, be like the soda of opening the bottle stopper, continuously splash a stingy bubble.
The liquid Hai is a kind of different liquid, it seethed at below zero 269 Celsius degreeses.Under this low temperature, the hydrogen also became solid, never make liquid Hai and air contact, because air will immediately superficial freeze into 1 F in the liquid Hai of strong and tough cover.
How much in the last years, the whole world only Holland card beautiful wood& amp;#183;The laboratory of Ao Nie Si can make liquid Hai.Till 1934, at British Lu Se Fu there the former Soviet Union the card ratio of scientist studying checked to invent new liquid Hai machine, the per hour can make 4 rise liquid Hai.After, the liquid Hai just gets an extensive research and application in the laboratory of all countries.
Today, the liquid Hai got an important application on the modern technique.For example want to receive the fax photograph that the cosmos airship delivers or receive the television signal that the satellite broadcasts, have to use liquid Hai.Three quantity enlargers that receive antenna bitter end want to keep under the low temperature of liquid Hai, otherwise can not receive a picture.
However, the marvellous place of liquid Hai still doesn't lie in low temperature.
Leak the cup of liquid Hai
Card beautiful wood& amp;#183;The Ao Nie Si is the first scientist who gets liquid Hai.He isn't****, Also want to make the temperature lowers further to get solid Hai.He fail(the solid Hai is 1926 radicle Suo the Mu is used the method of lowering the temperature and aggrandizement pressure to get first of), but gets a result that didn't anticipate.
Lower along with the temperature to general liquid, the density will increase gradually,beats by dre cheap.Card beautiful wood& amp;#183;The Ao Nie Si makes the temperature of liquid Hai descend, indeed as expected, the density of liquid Hai enlarged.But, when the temperature descends to below zero 271 Celsius degreeses, the strange affair appeared, the liquid Hai started to stop short a bubble and became to be like a crystal similar transparent, a move also motionless, seem one pond stagnant water, but the density suddenly let up again.
This is another liquid Hai.Card beautiful wood& amp;#183;The Ao Nie Si is called the Hai Ⅰ to ex- kind of effervescent liquid Hai, but empress a kind of liquid Hai for holding still does Hai Ⅱ.
Chase a small glass cup press in the Hai Ⅱmedium.The glass cup is should be empty, but leads a short while, the cup bottom appeared liquid Hai and slowly rose and the liquid Hai of cup outside is similar even.
This prosperous the small glass cup of liquid Hai put forward and hang empty in the half.See, the glass cup underneath appeared liquid Hai, 1 drop, 2 drop, 3 drop ……different meeting, the liquid Hai in the cup "leak"ed light.Is a glass cup to leak?Not, the glass cup is also gastight at 1:00.Is this what is the row?
Originally Hai Ⅱcan flow back, it will along the wall of glass cup climbs into and climbs out.This is the phenomenon had never run into in our daily life, only would take place in the low temperature world.This kind of phenomenon is called "super liquidity" and has the Hai of "super liquidity" Ⅱbe called super fluid.
Afterwards, many scientists studied this kind of strange phenomenon, and then had many new detections.Among them, 1938 is most interesting the orchid etc. person to discover of Hai knife fountain.
Take care of in a glass in, pack very thin emery, the top end connects out a mouth of thinly spraying.Immerse this glass tube to the Hai Ⅱmedium, use up to shine on glass to take care of thick lower part, thin spray a mouth and then will spew out Hai Ⅱof fountain, simply being more strong to spray more highly can be up to count a Li rice.
Hai Ⅱthe fountain is also the special property of super fluid.In this experiment, the light can directly become a machine ability.
Magic world
Everyone still remembers to pull a Mu match various marvellous experiment that various material puts liquid air!Various material puts in the liquid Hai, the circumstance is more marvellous.
See!Under the temperature of liquid Hai, a lead wreath, there is a shot put on the wreath.The shot put seemed to lose weight, will float to float on the wreath and hold certain distance with environmental protection.
See again
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