Colloidal chemistry is the branch of chemistry that studies colloids, which are mixtures where one substance (the dispersed phase) is evenly distributed throughout another substance (the continuous phase). These mixtures typically consist of particles ranging from about 1 nanometer to 1 micron in size.
The Sud Aviation Super-Caravelle is a French twin-engine jet airliner that was developed in the 1960s. It is an extended version of the earlier Sud Aviation Caravelle, which was one of the first jets designed specifically for short and medium-haul passenger flights. The Super-Caravelle featured improvements in range, capacity, and performance compared to its predecessor.
The Davisson–Germer Prize in Atomic or Surface Physics is an award established by the American Physical Society (APS) in honor of Clinton Davisson and Lester Germer, who are known for their foundational work in the field of electron diffraction and the study of surface phenomena. The prize recognizes and honors outstanding achievements in atomic or surface physics, with a focus on fundamental contributions that advance the understanding of these fields.
Disjoining pressure is a concept in physical chemistry and materials science that refers to the pressure difference across a thin film or interface due to molecular interactions and forces. It is particularly relevant in the study of thin liquid films, such as those found in emulsions, foams, or biological membranes. Disjoining pressure arises from three primary sources: 1. **Van der Waals Forces**: These are attractive forces that can cause thin films to collapse when the film thickness is reduced.
The Hertz–Knudsen equation is a fundamental relationship in physical chemistry used to describe the evaporation and condensation of a substance in the context of phase transitions, particularly at the interface between a liquid and vapor or a solid and vapor. The equation provides a way to relate the pressure of a vapor in equilibrium with its liquid phase to the rate of evaporation and the molecular characteristics of the substance.
Interfacial rheology is the study of the mechanical properties and behavior of interfaces, typically between two immiscible phases, such as liquids, gases, or solids. This field focuses on how forces and deformations affect the interface and how the interfacial properties influence the overall behavior of the materials involved.
Liquid marbles are small droplets of liquid that are encapsulated in a hydrophobic (water-repelling) solid coating, which prevents the liquid from wetting the surface and allows it to behave like a small, discrete marble. This phenomenon is achieved by the process of coating the liquid droplet with a layer of solid particles such as hydrophobic powders (like hydrophobic silica, starch, or polymer beads), which cling to the droplet's surface.
The sea surface microlayer (SML) is the thin layer of water that resides at the air-sea interface, typically extending from the ocean surface down to about 1 millimeter (up to several millimeters in some cases). This layer is characterized by distinct physical, chemical, and biological properties when compared to the underlying water column.
The Vroman effect refers to a phenomenon in immunology where different types of proteins or antibodies compete for binding sites on cell surfaces. Specifically, it describes how certain proteins, such as plasma proteins, adhere to a surface (like endothelial cells) and can be gradually replaced by other proteins that have a higher affinity for the binding sites or are present in higher concentrations. This effect is named after the scientist who first described it, and it highlights the dynamic nature of protein interactions within biological systems.
Rokhlin's theorem is a fundamental result in the theory of measure and ergodic theory, particularly in the context of dynamics on compact spaces. Named after the mathematician Vladimir Rokhlin, the theorem provides a powerful tool for understanding the structure of measure-preserving transformations. ### Statement of the Theorem Rokhlin's theorem specifically deals with the existence of invariant measures for ergodic transformations.
Ronald Venetiaan is a Surinamese politician and attorney who served as the President of Suriname from 1991 to 1996 and again from 2001 to 2005. He was a member of the Progressive Reform Party (VHP) and played a significant role in Surinamese politics over several decades. Venetiaan is known for his contributions to the country's democratic processes and governance during a time of political transition in Suriname.
In Queensland, Australia, survey marks are reference points used in land surveying to establish precise locations and define boundaries. These marks are critical for ensuring accurate measurements and are used by surveyors when conducting land surveys for various purposes, including property development, construction, and land division.
Only certain battery voltages exist, because this voltage depends intrinsically on the battery's chemical composition.
learn.sparkfun.com/tutorials/battery-technologies/all (CC BY-SA) has a very good summary list, reordered from lowest to highest voltage:
Battery ShapeChemistryNominal VoltageRechargeable?
AA, AAA, C, D (Rechargeable)NiMH or NiCd1.2VYes
AA, AAA, C, and DAlkaline or Zinc-carbon1.5VNo
Coin CellLithium3VNo
Silver Flat PackLithium Polymer (LiPo)3.7VYes
9VAlkaline or Zinc-carbon9VNo
Car BatterySix-cell lead acid12.6VYes
Weston cell by Ciro Santilli 40 Updated 2025-07-16
A dioptra is an ancient surveying instrument used for measuring angles in horizontal and vertical planes. It dates back to ancient Greece and was employed by architects, engineers, and astronomers to aid in the construction of buildings, the mapping of land, and the observation of celestial bodies. The instrument typically consists of a straightedge or a graduated arc mounted on a stand, allowing for precise angle measurement.

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