A Rubens tube, also known as a flame tube or a standing wave tube, is a demonstration apparatus often used in physics to visualize the relationship between sound waves and pressure variations. It consists of a long metal tube with holes along the top, filled with a flammable gas, such as propane or methane. Here's how it works: 1. **Sound Waves**: A loudspeaker is placed at one end of the tube, generating sound waves that travel through the air inside the tube.
Tyndall's bar breaker, also known as Tyndall's bar experiment, is a demonstration of the scattering of light, typically used to illustrate the principles of light scattering and the Tyndall effect. Named after the Irish scientist John Tyndall, it illustrates how light interacts with small particles suspended in a medium (such as a colloid). In the experiment, a beam of light is directed through a liquid containing suspended particles.
The "water thread experiment" generally refers to an experiment designed to demonstrate the principles of surface tension and fluid dynamics. While there may not be a widely recognized experiment specifically named the "water thread experiment," it sounds similar to demonstrations that illustrate how water can form threads or beads due to its cohesive property.
The Berthold Leibinger Innovationspreis, or Berthold Leibinger Innovation Award, is a prestigious award recognizing outstanding innovations in the field of photonics and laser technology. Established in honor of Berthold Leibinger, the former chairman of the TRUMPF Group, the award aims to promote creativity and developments that contribute to technological advancements in photonics.
The Extreme Light Infrastructure (ELI) is a major international research initiative aimed at creating and utilizing the most intense laser systems in the world. It is designed to push the boundaries of laser technology and explore its applications in various fields, including physics, material science, biology, medicine, and engineering.
The International Physics Olympiad (IPhO) is an annual competition for high school students from around the world, focused on the subject of physics. Established in 1967, the event aims to promote the study of physics and foster friendships among young scientists across different countries. Participants typically engage in both theoretical and experimental rounds. The theoretical component usually consists of challenging problem-solving questions that test students' understanding of fundamental concepts and their ability to apply them.
Poincaré Seminars are academic events that focus on discussions in mathematics and theoretical physics, often featuring lectures from esteemed researchers in these fields. Named after the French mathematician Henri Poincaré, these seminars aim to foster collaboration and exchange ideas among mathematicians and physicists. The seminars typically cover a range of topics, including but not limited to geometry, topology, dynamical systems, statistical mechanics, and quantum physics.
HKS is a color system commonly used in the printing and graphic design industries, especially in Europe. It was developed by the HKS Group, which is based in Germany. The HKS color system consists of a wide range of colors that are used for spot color printing, which means they are applied directly to paper rather than being created through the mixing of CMYK (Cyan, Magenta, Yellow, Black) inks.
The Asia-Oceania Federation of Organizations for Medical Physics (AFOMP) is a professional organization that aims to promote and advance the practice and education of medical physics in the Asia-Oceania region. It serves as a platform for collaboration, knowledge sharing, and professional development among medical physicists and related professionals involved in the application of physics in medicine, particularly in the fields of radiation therapy, medical imaging, and radiation safety.
Clarendon Laboratory is a prominent research facility located at the University of Oxford in the United Kingdom. Established in the 19th century, it is renowned for its contributions to the fields of physics and engineering. The laboratory is known for its cutting-edge research in various areas, including condensed matter physics, quantum optics, and materials science. The facility houses advanced laboratories and equipment that support both experimental and theoretical investigations.
The Laboratory of Instrumentation and Experimental Particle Physics (LIP) is a research institution focused on the development and application of advanced instrumentation, as well as conducting experiments related to particle physics. While the specific details and focus areas can vary by institution or country, generally, LIP operates on the following principles: 1. **Instrumentation**: LIP often involves the development of sophisticated detectors and measurement systems used in the study of fundamental particles and their interactions.
The Astro Space Center (ASC) is a scientific research institution in Russia focused on space and astrophysics. It is part of the All-Russian Research Institute of Experimental Physics (VNIIFTRI) and is located in Moscow. The center conducts various types of research related to space exploration, astrophysics, and space technologies. Its activities often include the development and testing of space instruments, conducting experiments on the behavior of materials in space environments, and supporting international space missions.
The Astronomical Calculation Institute (Astronomisches Rechen-Institut, or ARI) is a research institution associated with Heidelberg University in Germany. It focuses on various fields of astronomy and astrophysics, particularly those related to celestial mechanics, ephemerides, and astronomical calculations. The institute is known for its work on the mathematical modeling of celestial bodies, planetary motions, and the development of computational methods for astronomical data analysis.
The Institute of Space and Planetary Astrophysics (ISPA) is a research institute typically focused on the study of astrophysics, specifically relating to space and planetary sciences. While organizations with this name can vary, they generally aim to promote research and education in areas such as planet formation, the dynamics of celestial bodies, and the conditions of planets and moons within our solar system and beyond.
The Institute of Theoretical Astrophysics (ITA) is an academic research institute that typically focuses on theoretical aspects of astrophysics and cosmology. Such institutes are often associated with universities and aim to advance understanding of the universe through mathematical models and simulations, exploring topics like the formation and evolution of galaxies, star formation, black holes, dark matter, and the cosmic microwave background.
The Bell Labs Holmdel Complex, located in Holmdel, New Jersey, is a historically significant site that was once home to Bell Telephone Laboratories (Bell Labs), one of the leading research and development facilities in the world. Established in the 1960s, the complex is notable for its distinctive architectural design, which was conceived by the architect Eero Saarinen. Bell Labs has been the birthplace of numerous groundbreaking innovations and discoveries in fields such as telecommunications, computer science, and materials science.
The High-frequency Active Auroral Research Program (HAARP) is a scientific research program that was originally developed to study the ionosphere, a part of the Earth's upper atmosphere. Established in the early 1990s, HAARP is located in Gakona, Alaska, and operates a powerful ionospheric research facility. The primary tool used by HAARP is a high-frequency (HF) transmitter that can send focused beams of radio frequency energy into the ionosphere.
The Hubert Curien Laboratory, known as the "Laboratoire Hubert Curien" (LHC), is a research laboratory located in Saint-Étienne, France. It is affiliated with the University Jean Monnet and focuses on various fields of research, including physics, engineering, and materials science. The laboratory is associated with studies in optics, nanotechnology, and various interdisciplinary projects.
The Institute for Theoretical Atomic, Molecular and Optical Physics (ITAMP) is a research institute affiliated with Harvard University and the Smithsonian Astrophysical Observatory. It focuses on theoretical studies in the areas of atomic, molecular, and optical (AMO) physics. Established in 1996, ITAMP promotes interdisciplinary research and collaboration among researchers who study the fundamental principles governing the interactions of atoms, molecules, and light.

Pinned article: Introduction to the OurBigBook Project

Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
We have two killer features:
  1. topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculus
    Articles of different users are sorted by upvote within each article page. This feature is a bit like:
    • a Wikipedia where each user can have their own version of each article
    • a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
    This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
    Figure 1.
    Screenshot of the "Derivative" topic page
    . View it live at: ourbigbook.com/go/topic/derivative
  2. local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:
    This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
    Figure 2.
    You can publish local OurBigBook lightweight markup files to either https://OurBigBook.com or as a static website
    .
    Figure 3.
    Visual Studio Code extension installation
    .
    Figure 4.
    Visual Studio Code extension tree navigation
    .
    Figure 5.
    Web editor
    . You can also edit articles on the Web editor without installing anything locally.
    Video 3.
    Edit locally and publish demo
    . Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.
    Video 4.
    OurBigBook Visual Studio Code extension editing and navigation demo
    . Source.
  3. https://raw.githubusercontent.com/ourbigbook/ourbigbook-media/master/feature/x/hilbert-space-arrow.png
  4. Infinitely deep tables of contents:
    Figure 6.
    Dynamic article tree with infinitely deep table of contents
    .
    Descendant pages can also show up as toplevel e.g.: ourbigbook.com/cirosantilli/chordate-subclade
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact