The surface tension 曾臻 应化0505 200561162
The surface tension 曾臻 应化0505 200561162
For example,we can see a little drop of water is on intimate terms with ball on the grass after rain.The mercury is close to on the ground when we break thermograph and to the suver outou the other nand,wean perform a magic with a lass fterpuns a needle n the surface carefully Then we can see the needle uir w out sinking,at the sane time forring hollow sideder the nee le
For example,we can see a little drop of water is on intimate terms with ball on the grass after rain.The mercury is close to ball on the ground when we break thermograph and let the silver out.On the other hand,we can perform a magic with a glass of water,putting a needle on the surface carefully .Then we can see the needle flutter without sinking,at the sane time forming hollow side under the needle
Then what's the surface tension?When liquid get in touch with gas,it form a surface layer. The mutual attraction inside this layer is surface tension.It can lead to shrink of surface of liquid automatically.The formation of surface tension due to the great cohesive force of molecularities of liquid.The 网出品 number of molecularities in surface is less than one inside.So they are given the force directing inside making the surface like a rubber film.They are inclined to shrink so as to reduce the surface a As we know,the spherical subject has thallest area in the same volume.Therefore,because of surface tension,the small drop of liquid attempt to keep spheroid.This is the 气相 reason why the drop of water approach to spheroid.The direction of surface tension is contact 不 with liquid surface.And it is vertical with any line of demarcation belonging to two parts of liquid At last the surface tension is only relevant to temperature
Then ,what’s the surface tension? When liquid get in touch with gas,it form a surface layer. The mutual attraction inside this layer is surface tension.It can lead to shrink of surface of liquid automatically. The formation of surface tension due to the great cohesive force of molecularities of liquid. The number of molecularities in surface is less than one inside. So they are given the force directing inside making the surface like a rubber film. They are inclined to shrink so as to reduce the surface area. As we know,the spherical subject has the smallest area in the same volume. Therefore,because of surface tension,the small drop of liquid attempt to keep spheroid. This is the reason why the drop of water approach to spheroid. The direction of surface tension is contact with liquid surface. And it is vertical with any line of demarcation belonging to two parts of liquid. At last,the surface tension is only relevant to temperature
表面张力分析仪-60 (Digital Surface Tension Analyzer)
表面张力分析仪-60 （Digital Surface Tension Analyzer ）
Chinete scientists have Sroved sometiielled Chowwater insects is how to ashiee a stable standing on the surface and not the sunken mystery Water Chow has been able to live in security on the water surface,standing or walking fast,as some researchers have to think,rely on the secretion of oil produced to the surface tension effects.In fact,the increase in water use their legs to a special classification to micro-nano-structure to achieve the effect of super-hydrophobic properties. "he
Chinese scientists have proved Chinese scientists have proved something called Chow water insects is something called Chow water insects is how to achieve a stable standing on the how to achieve a stable standing on the surface and not the sunken mystery surface and not the sunken mystery Water Chow has been able to live in security on the Water Chow has been able to live in security on the water surface, standing or water surface, standing or walking fast, as some walking fast, as some researchers have to think, rely on the secretion of oil researchers have to think, rely on the secretion of oil produced to the surface tension effects. In fact, the produced to the surface tension effects. In fact, the increase in water use their legs to a special increase in water use their legs to a special classification to micro classification to micro -nano -structure to achieve the structure to achieve the effect of super effect of super-hydrophobic properties. hydrophobic properties
Despite the increase in the secretion of water in the leg to the surface is hydrophobic oil,but it has provided to the surface tension is very small.be able to increase investment in water standing quietly on the water surfacelike edlaetil to smear the deformation needle can float on the ersuriace Neve theless,they are not sufficient to supportt insecis on the water surface run fast, slightly because of s would make it sank.Through hig esoluHon held emission sca nning electron microscope observation,Researchers found that the increase in water coverage of the legs of countless orientation of a small needle-shaped steel wool,These steel wool most of the length of 50 m,diameter of the root from a 3 m-graded to the apex of hundreds of nanotechnology.Interestingly,in each hair on the surface of steel have more precise spiral of nano-scale structure of the trench.It is this special micro-nano-structuresmakes air can be effectively adsorbed on these micro andan seel wool trench the cracks,on its surface to form a layer of sagas ilm,thereby preventing the infiltration of exposure.on themance of macro-water ports legs super-hydrophobic properties.allow it to walk on the water's surface more than 4 mm deep water vortex will not pierce the surface. 打
Despite the increase in the secretion of water in the leg to the Despite the increase in the secretion of water in the leg to the surface is hydrophobic oil, but it has provided to the surface t surface is hydrophobic oil, but it has provided to the surface tension is very small. be able to increase investment in water standing is very small. be able to increase investment in water standing quietly on the water surface, like edible oil to smear the defor quietly on the water surface, like edible oil to smear the deformation needle can float on the water surface, Nevertheless, they are no needle can float on the water surface, Nevertheless, they are not sufficient to support the insects on the water surface run fast, sufficient to support the insects on the water surface run fast, slightly because of contacts or slightly because of contacts or other disturbances would make it other disturbances would make it sank. Through high sank. Through high -resolution field emission scanning electron resolution field emission scanning electron microscope observation, Research microscope observation, Researchers found that the increase in ers found that the increase in water coverage of the legs of countless orientation of a small water coverage of the legs of countless orientation of a small needle -shaped steel wool, These steel wool most of the length of 50 shaped steel wool, These steel wool most of the length of 50 m, diameter of the root from a 3 m -graded to the apex of hundreds graded to the apex of hundreds of nanotechnology nanotechnology. Interestingly, in each hair on the surface of steel . Interestingly, in each hair on the surface of steel have more precise spiral of have more precise spiral of nano -scale structure of the trench. It is scale structure of the trench. It is this special micro this special micro -nano -structures, makes air can be effectively structures, makes air can be effectively adsorbed on these micro and adsorbed on these micro and nano steel wool trench the cracks, on steel wool trench the cracks, on its surface to form a layer of stable gas film, thereby preventi its surface to form a layer of stable gas film, thereby preventing the infiltration of exposure. on the performance of macro infiltration of exposure. on the performance of macro -water ports water ports legs super legs super-hydrophobic properties. allow it to walk on the water's hydrophobic properties. allow it to walk on the water's surface more than 4 mm deep water vortex will not pierce the surface more than 4 mm deep water vortex will not pierce the surface. surface
Only one of the legs in the water to reach the greatest supportive of their total body weight 15 times.It is the increase in the surface water of this super load capacity and allow it to stand securely on the surface,and can run fast and jump,even in the hurricane or fast currents have been able to move as freely and notdrown.The new findings will help guide the design of a new type of micro-water machines,such as not sinking,low fluid resistance,Quick propulsion capabilities,low energy consumption-driven,will not produce pollution and environmental friendliness
Only one of the legs in the water to reach the Only one of the legs in the water to reach the greatest supportive of their total body weight greatest supportive of their total body weight 15 times. It is the increase in the surface 15 times. It is the increase in the surface water of this super load capacity and allow it water of this super load capacity and allow it to stand securely on the surface, and can run to stand securely on the surface, and can run fast and jump, even in the hurricane or fast fast and jump, even in the hurricane or fast currents have been able to move as freely currents have been able to move as freely and not drown. The new findings will help and not drown. The new findings will help guide the design of a new type of micro guide the design of a new type of micro -water machines, such as : not sinking, low fluid machines, such as : not sinking, low fluid resistance, Quick propulsion capabilities, low resistance, Quick propulsion capabilities, low energy consumption energy consumption -driven, will not produce driven, will not produce pollution and environmental friendliness. pollution and environmental friendliness
w PhotoPS.com Carnegie Mellon engineering assistant It can be a chemical sensor professor Metin Sitti led the successful monitoring water pollution or development of a Water running to the other poison substances; micro-robot,it can,like insects,like a After missing camera and stroll in the water easily. then also be used to detect;It The robot has been able to stand in water,becauseemove the surface dirt. they are very light and not break the surface tension of water.For a long time.people have been like insects that wave is the same as promoting vessels on their legs and have a wave forward.1993,Stanford University marine biologist Mark Denny first raised the doubt.Last year,the Massachusetts university mathematician John M.W.Bush and two graduate students spreading through the water layer to fine and the high-power video untied the answer.Bush and his graduate students found that the insects legs down with pressurized water but did not damage the water be long and bounced back to the front of Mobile,the same principle as trampoline.Sitti's robot only 1 gram. which is semi-important pieces of 3.10 coins.At present,the price is relatively low
Carnegie Mellon engineering assistant professor Metin Sitti led the successful development of a Water running to the micro-robot, it can, like insects, like a stroll in the water easily. It can be a chemical sensor monitoring water pollution or other poison substances; After missing camera and then also be used to detect; It The robot has been able to stand in water, because The robot has been able to stand in water, because can remove the surface dirt. they are very light and not break the surface tension of they are very light and not break the surface tension of water. For a long time, people have been like insects water. For a long time, people have been like insects that wave is the same as that wave is the same as promoting vessels on their promoting vessels on their legs and have a wave forward. 1993, Stanford legs and have a wave forward. 1993, Stanford University marine biologist Mark Denny first raised the University marine biologist Mark Denny first raised the doubt. Last year, the Massachusetts university doubt. Last year, the Massachusetts university mathematician John M. W. Bush and two graduate mathematician John M. W. Bush and two graduate students spreading through th students spreading through the water layer to fine and e water layer to fine and the high the high -power video untied the answer. Bush and his power video untied the answer. Bush and his graduate students found that the insects legs down graduate students found that the insects legs down with pressurized water but did not damage the water with pressurized water but did not damage the water be long and bounced back to be long and bounced back to the front of Mobile, the the front of Mobile, the same principle as trampoline. same principle as trampoline. Sitti's robot only 1 gram, 's robot only 1 gram, which is semi which is semi -important pieces of 3.10 coins. At important pieces of 3.10 coins. At present, the price is relatively low. present, the price is relatively low
神六航天员如何吃饭 畏0 的公念绣恩 Yang Liwei to go up in space,claiming good appetite, space food tastes very good by."The spacecraft is to orbit about an hour after 37 pm,I eat in the space o the first meal.July 8-hour intervals thereafter.Fate two meals,mainly small cakes,fish Meatbal,many 为% e出万 varieties."Yang Liwei said. Early spaca rogndeed a bit tedious, Through continuous vas,and the nte Space Station can be improvement,Europe and a题sured ys of not re-kind,their favo南co由ett德na6 o choose,for example the United States have the mustard,mavonnse,tomato sauce,liquid and salt astronauts can use an and Chil ese astronauts n enjoy dishes, ef Chenpi fear ordinary spoon and fork to is dang h. lunch.tableware was fixed calcium loss. on the table,food on their hanges the own surface tension and viscosity,the yard will not fly away from the plate Next,the astronauts will atio have to solve the problem is only one:Do not let your mouth right under the nose of the left from lunch!
Yang Liwei to go up in space, claiming good appetite, space food tastes very good by. "The spacecraft is to orbit about an hour after 37 pm, I eat in the space of the first meal. July 8-hour intervals thereafter. I ate two meals, mainly small cakes, fish Meatbal, many varieties. "Yang Liwei said. Early space food is indeed a bit tedious, not what it was, and the International Space Station can be assured of food within six days of not re-kind, their favorite condiment can also choose, for example, mustard, mayonnaise, tomato sauce, liquid and salt and pepper. Chinese astronauts still can enjoy dishes, rice, chicken, beef Chenpi fear of failure is dangerous enough stomach. Space flight will lead to the astronauts calcium loss, muscle atrophy and the decrease in the number of red blood cells. So in space to address their physiological changes in the index of dietary nutrients make the appropriate adjustments. For example, muscle atrophy on the requested food must provide sufficient quality protein, Osteoporosis is the loss of food requirements must provide the calcium, and the appropriate ratio of calcium and vitamin D. Through continuous Through continuous improvement, Europe and improvement, Europe and the United States have the the United States have the astronauts can use an astronauts can use an ordinary spoon and fork to ordinary spoon and fork to lunch. tableware was fixed lunch. tableware was fixed on the table, food on their on the table, food on their own surface tension and own surface tension and viscosity, the yard will not viscosity, the yard will not fly away from the plate. fly away from the plate. Next, the astronauts will Next, the astronauts will have to solve the problem have to solve the problem is only one : Do not let your is only one : Do not let your mouth right under the nose mouth right under the nose of the left from lunch! of the left from lunch!
In eacn one or arveolar surface,there is a liquid-. layer,forming a liquid-air interface thus the liquid surface tension between the T and alveolar like a soap bubble,have the tendency. Pulmonary surfactant by alveolar to back down,according to theory of physics type 2.cell secretion of a lipoprotein some liquid formed by the contraction is the major-components.of two soft vacuole within the vacuoles pressure (P),and Acyl-Tecithin.Because it is a single. the liquid is proportional to the surface tension: molecule form of alveolar fluid and the vacuole is inversely proportional to thedistribufion in the surface layer,so radius.Therefore,even if the same surface that the alveolar surface tension tension of the same liquid,as Tong as the vacuole formation of the difference in size, reduction to the original seventh- small vacuoles pressure will oxceed the big -fourteenth.And alveolar surfactant bubble.So when two different one from the molecules in comparatively small vacuole lumen connectivity,small vacuoles alveolar intensive,and in the more within the gas pressure will be less mobile sparsely alveolar,This reduction in artillery.Even small bubble is getting smaller surface tension of different functions, and smaller and eventually balk Finally,we will so that the size of the alveolar be left with a greater Chande bullous.Alone in- pressure retraction relative balance the normal breathing process will not happen this phenomenon,with alveolar surfactant In order to maintain a certain state of substances mHlation
In each one of alveolar surface, there is a liquid In each one of alveolar surface, there is a liquid layer, forming a liquid layer, forming a liquid-air interface thus the air interface thus the liquid surface tension between the T and liquid surface tension between the T and alveolar like a soap bubble, have the tendency alveolar like a soap bubble, have the tendency to back down, according to theory of physics, to back down, according to theory of physics, some liquid formed by the contraction is some liquid formed by the contraction is vacuole within the vacuoles pressure (P), and vacuole within the vacuoles pressure (P), and the liquid is proportional to the surface tension, the liquid is proportional to the surface tension, and the vacuole is inversely proportional to the and the vacuole is inversely proportional to the radius. Therefore, even radius. Therefore, even if the same surface if the same surface tension of the same liquid, as long as the tension of the same liquid, as long as the vacuole formation of the difference in size, vacuole formation of the difference in size, small vacuoles pressure will exceed the big small vacuoles pressure will exceed the big bubble. So when two different one from the bubble. So when two different one from the vacuole lumen connectivity, small vacuoles vacuole lumen connectivity, small vacuoles within the gas pressure within the gas pressure will be less mobile will be less mobile artillery. Even small artillery. Even small bubble is getting smaller bubble is getting smaller and smaller, and eventually and smaller, and eventually balk Finally, we will balk Finally, we will be left with a greater be left with a greater Chande bullous Chande bullous. Alone in . Alone in the normal breathing process will not happen the normal breathing process will not happen this phenomenon, with alveolar surfactant this phenomenon, with alveolar surfactant substances. substances. Pulmonary surfactant by alveolar Pulmonary surfactant by alveolar type 2 cell secretion of a lipoprotein, type 2 cell secretion of a lipoprotein, the major components of two soft the major components of two soft Acyl - lecithin. Because it is a single lecithin. Because it is a single - molecule form of alveolar fluid molecule form of alveolar fluid distribution in the surface layer, so distribution in the surface layer, so that the alveolar surface tension that the alveolar surface tension reduction to the original seventh reduction to the original seventh - fourteenth. And alveolar surfactant fourteenth. And alveolar surfactant molecules in comparatively small molecules in comparatively small alveolar intensive, and in the more alveolar intensive, and in the more sparsely alveolar, This reduction in sparsely alveolar, This reduction in surface tension of different functions, surface tension of different functions, so that the size of the alveolar so that the size of the alveolar pressure retraction relative balance pressure retraction relative balance In order to maintain a certain state of In order to maintain a certain state of inflation. inflation