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04:12 IWF (Göttingen) German 2004

The Uncertainty Relation

The uncertainty relation of Heisenberg, which is the basic principle of quantum mechanics, is explained in this animation (chalk on cupboard technique).
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:31 IWF (Göttingen) German 2004

Leiterschaukel im Magnetfeld

The behaviour of a wire loop under current flow in the homogeneous field of a horseshoe magnet is examined. First the experimental setup is introduced, then the voltage is increased step by step and the deviation of the loop is observed.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:35 IWF (Göttingen) German 2004

Turbulente Strömung

The behaviour of water flowing around a circular profile is examined. The shape of the streamlines is shown, especially the fact that they tear off behind the body and unstable vortexing occurs is examined in slow-motion. One can see that the flow velocity changes in space and time.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:37 IWF (Göttingen) German 2004

Laminare Strömung

The behaviour of water flowing around a streamline profile is examined. The shape of the streamlines is shown and namely the fact that they approximately show a time constant streamline density and velocity at each place. With slow-motion.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:59 IWF (Göttingen) German 2004

Schmelzen von Metall

The temperature profile of a piece of metal is examined during continous energy input. A piece of Wood's metal is heated on a hot plate. A digital thermometer shows the temperature while the melting process is filmed. A corresponding temperature-time diagram is recorded for later evaluation. The energy input, the specific melting temperature, and the entropy difference are calculated and compared with other values.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:41 IWF (Göttingen) German 2004

Kontinuitätsgleichung

The flow behaviour of water in pipe constriction is demonstrated. The flow is examined by means of the shape of the streamlines. From mass continuity equations can be derived that compare the velocity quotient with the flown area. This is exemplarily shown and calculated.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:03 IWF (Göttingen) German 2004

Tripelpunkt

The coincidence of the solid, liquid and gaseous aggregate state of water is demonstrated. A bowl of water is placed in the bell jar. At a pressure of 6,1 millibar and a temperature of 0,01°C the water freezes, at the same time it starts to bubble here and there - it is boiling! With slow-motion.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:27 IWF (Göttingen) German 2004

Dielektrikum im Kondensator

The behaviour of a dielectric fluid between two metal sheets is shown when voltage is applied. The experimental set-up is explained with a diagram, then voltage application is varied in the experiment, resulting in the rising and falling of the fluid. The adhesive forces are also discussed.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) Chinese 2004

Dragon Well

In Han myth the dragon symbolizes power as he rules over the element water, i.e. the outcome of the next harvest, peoples' health and wealth. His temper can ruin everything through extreme floods or draught. The Daban Well in the outskirts of Jianshui dates back to the Ming Dynasty, and although tap water is available, people prefer the well's water and perform rituals in honor of the Dragon King.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: Chinese
Offline Collection IWF (Göttingen) Chinese 2004

Street Peddler

The income gap between rural and urban communities is extreme, and in Yunnan Province causes growing migration to its capital Kunming. With their home-made pushcarts street peddlers are considered a threat to the city's image building. Constantly on the run, the peddlers themselves would prefer clear regulations allowing a space for them to sell their food, and have an income.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: Chinese
Offline Collection IWF (Göttingen) Chinese 2004

Lost in the City

The film focuses on a Miao (Meng, Mhong or Hmong) community and their children living in the suburbs of Kunming City. As their parents work as shoe polishers in the provincial capital of Yunnan, the second generation of migrants from neighbouring Guizhou Province grows up in an environment that requires some rituals and customs as protection.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: Chinese
05:09 IWF (Göttingen) German 2004

Umströmung verschiedener Hindernisse im Strömungskanal

The flow of water is visualized with tiny particles. The flow types laminar and turbulent are introduced and examined using different profiles. Rectangular, square, fully or partly cylindrical, streamlined and aerofoil shaped bodies are put in the flow channel. Finally the flow in a pipe constriction is examined.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:35 IWF (Göttingen) German 2004

Tief- und Hochpass

The relationship between input and output voltage is examined. The circuits of low-pass and high-pass filter are demonstrated at the beginning of the tests. Then an alternating voltage of increasing frequency is applied. The oscilloscope shows the amplitudes of input and output voltage and the phase shift. Parallel to this experiment the amplitude-frequency diagram is recorded.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
04:04 IWF (Göttingen) German 2004

Fadenpendel

The dependence of vibration time of the string pendulum from different factors is examined and finally demonstrated in phase space. After introducing the experimental setup several test series are carried out. The first one examines the impact of the pendulum length on the vibration period, showing three different lengths. The dependency from the pendulum mass is examined with two bodies of different density. In the third part different deviations and their effect on the vibration period are demonstrated. Finally, the phase space and its timely development is shown with a real pendulum.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:09 IWF (Göttingen) German 2004

Kapazität einer Kugel

Experimental determination of the capacitance of a sphere.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
07:36 IWF (Göttingen) German 2004

Stromlinien-Modellversuche

The goal is the demonstration of two-dimensional streamline patterns as they occur when non-viscous fluids flow around obstacles. The patterns shown are models, since they have been produced in a viscous fluid under conditions of laminar flow.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:59 IWF (Göttingen) German 2004

Maxwellsche Scheibe

A body that is being accelerated downward weighs less than when at rest. This is demonstrated with a flywheel on a shaft suspended on one arm of a household scale (Maxwell's disk). It is suspended on one arm of the scale with two strings which wrap around the thin shaft. When the flywheel is released, it accelerates downward, and the scale reads a reduced weight. During the subsequent rise (the flywheel still accelerating downward!) the scale again indicates a reduced weight.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
00:54 IWF (Göttingen) German 2004

Schwanke Achse

An object rotates stably around its axis of maximum moment of inertia, even if it is attached to a bent supple shaft. The experiment also shows that particles leave a rotating object by flying off in a tangential direction.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:27 IWF (Göttingen) German 2004

Elektrischer Wind

At sharp corners, even small voltages can lead to large electric fields. They can ionize the surrounding air, making it electrically conducting.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:41 IWF (Göttingen) German 2004

Interpretation der Elektronendichte - beta-Faltblatt

The video clip shows the electron density measuring of a simple protein - the lysozyme from egg white - visualized by means of a special software (XTAL View).
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
Offline Collection IWF (Göttingen) Chinese 2004

Herbalist Family

The transmission of indigenous medical knowledge in a Sani family living close to the Stone Forest in Yunnan has been passed on through six generations. As specialists for bone diseases in the area, this family mainly uses indigenous herbs, but also some "Western medicine".
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: Chinese
Offline Collection IWF (Göttingen) Chinese 2004

Back

Zheng Mingli lives in the provincial capital Kunming of Yunnan Province. Her relatives, however, come from Heshun Village on the Chinese border with Burma. During the summer of 2002 the filmmaker goes back to the township to take part in the mid July festival for the souls of the dead at the house of her uncle, the only relative who remembers her.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: Chinese
Offline Collection IWF (Göttingen) Chinese 2004

The Beauty of Black

The Dai (Thai) people in Yunnan Province can't be classified in to one homogenous group. The Daisai have lived on the upper reaches of the Red River at the foot of Ailiao Mountain for generations. Here, teeth dying is still practiced by the women, while modernization and development bring about challenges threatening their traditions.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: Chinese
02:52 IWF (Göttingen) German 2004

Bestimmung von Cp/Cv nach Rüchardt

The ratio cp/cv is determined by means of a small object swinging on a gas column. After introducing the experimental setup air and argon are measured three times each. There is no interpretation but all relevant data are given in order to calculate the adiabatic index of both gases.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:42 IWF (Göttingen) German 2004

Wirbelstrombremse

Forces are demonstrated which arise when an electric conductor moves through an inhomogeneous magnetic field.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
05:40 IWF (Göttingen) German 2004

Erzeugung und Überlagerung kohärenter Wellen zu Interferenzstrukturen

Various wave types and experimental setups are used to illustrate the phenomenon. The interfering of waves generated by phase-locked transmitters is illustrated with water waves and then with waters waves. The interference of waves which were split by a beam divider is demonstrated with microwaves. Here the maxima and minima can be located well. A Michelson interferometer is used for the demonstration of light waves.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
04:11 IWF (Göttingen) German 2004

Druckverhältnisse einer strömenden realen Flüssigkeit

The pressure patterns of streaming water in different pipe configurations are examined. Several vertical manometers which indicate the static pressure are fixed at the horizontal flow pipe. In a first experiment the dependency of the pressure from the increasing friction due to flow velocity are demonstrated in a cylindrical pipe. At a slow efflux velocity the water shows a nearly ideal behaviour, at high velocities the impact of friction is can be seen clearly. In other experiments the effects of pipe constrictions are examined.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
00:50 IWF (Göttingen) German 2004

Kräfte im elektrischen Feld

Between two surfaces separated only by a small gap, small voltages can lead to appreciable forces.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:22 IWF (Göttingen) German 2004

Seifenblasen im elektrischen Feld

The repulsive force between two bodies carrying charges of the same sign will be demonstrated.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:28 IWF (Göttingen) German 2004

Magnetischer Spannungsmesser

A long induction coil wound on a flexible hose is used to explore the magnetic field near current carrying conductors and also near a permanent magnet.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:31 IWF (Göttingen) German 2004

Doppelbrechung und Polarisation von Licht

The experiment
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:10 IWF (Göttingen) German 2004

Induktion in bewegten Leitern

A conductor moving in a magnetic field experiences an electric field.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:38 IWF (Göttingen) German 2004

Ionenwanderung

The migration of potassium permanganate ions to the positive electrode is demonstrated. By means of chronometry and all further data the second part of the film shows the evaluation including the drift velocity and the calculation of the avarage ion mobility compared with the published value.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:04 IWF (Göttingen) German 2004

Induktion in ruhenden Leitern

A changing magnetic field generates an electric field.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
05:35 IWF (Göttingen) German 2004

Farbfadenversuch nach Reynolds - Übergang von laminarer zu turbulenter Strömung

The video of the Reynolds transition experiment, developed for physics teaching, shows the continuous transition from laminar to turbulent flow. Additionally, the critical Reynolds number of the experimental setup is determined approximately. Using this video the student can measure all necessary data and then calculate his result.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:50 IWF (Göttingen) German 2004

Absorptions- und Emissionsspektrum von Natrium

The atomic spectra of absorption and emission in Sodium are examined. In the first part the light of a halogen bulb is directed through a cell with sodium vapour and then spatially divided by means of the grating spectrograph. During evaporation in the cell both D lines of sodium are absorbed more and more clearly from the continuous spectrum of the lamp. In the second part the achieved spectrum is compared with a sodium vapour lamp. One can see that to each resonance absorption line belongs an emission line of the same wavelength and vice versa. It thus follows that each wavelength which is absorbed can also occur in emission if enough energy was applied to the atom.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
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