The history of perpetual motion machines is a fascinating journey that spans centuries, reflecting the human quest for knowledge and understanding of the laws of physics. Perpetual motion machines are theoretical devices that can operate indefinitely without an external energy source, thereby violating the first or second laws of thermodynamics. Here’s a timeline of significant developments in the history of these machines: ### Ancient and Medieval Concepts - **Ancient Thoughts**: The concept of perpetual motion dates back to ancient civilizations.
Carnot's theorem is a fundamental principle in thermodynamics that provides important insights into the efficiency of heat engines. Formulated by the French physicist Sadi Carnot in the early 19th century, the theorem states: 1. **Maximum Efficiency**: No heat engine operating between two heat reservoirs can be more efficient than a Carnot engine operating between the same two reservoirs. The efficiency of a Carnot engine is determined solely by the temperatures of the hot and cold reservoirs.
Kopp's law by Wikipedia Bot 0
Kopp's Law, also known as Kopp's Rule, is a principle in thermodynamics and physical chemistry that states that the heat capacity of a solid can be approximated by a linear function of its temperature, particularly at moderate temperatures.
The Third Law of Thermodynamics states that as the temperature of a perfect crystal approaches absolute zero (0 Kelvin, or -273.15 degrees Celsius), the entropy of that crystal approaches a minimum value, which is typically taken to be zero. In simpler terms, it implies that at absolute zero, a perfect crystalline substance would have no disorder and hence no entropy. This law has important implications in physics and chemistry, particularly in understanding the behavior of materials at very low temperatures and the concept of absolute zero.
Storm Blas by Wikipedia Bot 0
As of my last knowledge update in October 2023, Storm Blas refers to a significant weather event that affected various regions, particularly in the southern parts of the United States and other areas. It is typically characterized by heavy rainfall, strong winds, and possible snow in colder regions. The name "Blas" is part of a naming convention used for storms, similar to how hurricanes are named.
1928 Thames flood by Wikipedia Bot 0
The 1928 Thames flood refers to a significant flood event that occurred in the United Kingdom, particularly affecting London and the surrounding areas along the River Thames. The flood took place in late December 1928, primarily on December 7th and 8th, following exceptionally heavy rainfall and high tides that overwhelmed the river's banks and flood defenses. The combination of these factors led to widespread flooding in several parts of London, causing extensive damage to homes, infrastructure, and businesses.
The Blizzard of January 1881, also known as the Great Blizzard of 1881, was a severe winter storm that struck the central United States from January 12 to January 15, 1881. It was particularly devastating in the states of Wyoming, Nebraska, and surrounding areas, leading to extreme snowfall, frigid temperatures, and strong winds. The storm developed rapidly, affecting a large swath of the country and resulting in blizzard conditions characterized by heavy snowfall and whiteout visibility.
Cyclone Andrea by Wikipedia Bot 0
As of my last update in October 2023, Cyclone Andrea does not correspond to a widely recognized or documented tropical cyclone in major meteorological records. It is possible that it refers to a localized event, perhaps a lesser-known storm or one that occurred after my last update. Cyclones are classified and named by various meteorological organizations based on their strength and location, and new storms can form regularly, especially in tropical and subtropical regions.
Cyclone Dagmar by Wikipedia Bot 0
Cyclone Dagmar refers to a significant weather event that occurred in December 2011 when a powerful storm system affected parts of Northern Europe, particularly Denmark, Norway, and Sweden. The storm brought high winds, heavy rainfall, and severe weather conditions, leading to disruptions in transportation and damage to infrastructure. Storms like Dagmar are part of a broader pattern of winter cyclones that can produce extreme weather in these regions, including blizzards and flooding.
Cyclone Joachim by Wikipedia Bot 0
As of my last knowledge update in October 2023, there was no record of a significant weather event or cyclone named "Joachim." Cyclones and hurricanes are named according to lists established by meteorological organizations, and new names can be assigned to storms as they form.
Cyclone Tini by Wikipedia Bot 0
As of October 2023, Cyclone Tini does not appear to be a notable or recognized tropical cyclone in historical records or recent weather events. It's possible that it could refer to a newly formed system that emerged after my last update, or it may not be a widely recognized name for an existing cyclone. Tropical cyclones, or hurricanes/typhoons depending on their location, are named based on lists created by regional meteorological organizations. These names often vary by year and region.
Cyclone Xynthia by Wikipedia Bot 0
Cyclone Xynthia was a significant storm that impacted parts of Europe, particularly in late February 2010. It originated as a low-pressure system over the Atlantic Ocean and intensified as it approached the European mainland. Xynthia brought heavy rainfall, strong winds, and severe flooding to various countries, including France, Spain, and Portugal. In France, the storm caused extensive damage, particularly in coastal areas, and led to numerous fatalities.
The Great Storm of 1987 was a powerful and destructive storm that struck parts of southern England and northern France on the night of October 15-16, 1987. It is often referred to as the "Great Storm" and is remembered for its intensity and the widespread damage it caused.
Hurricane Gonzalo by Wikipedia Bot 0
Hurricane Gonzalo was a powerful Atlantic hurricane that occurred in October 2014. It was the seventh named storm and the fourth hurricane of the 2014 Atlantic hurricane season. Here are some key details about Hurricane Gonzalo: 1. **Formation**: Gonzalo formed on October 13, 2014, from a tropical wave that moved off the west coast of Africa.
Richard A. Cody by Wikipedia Bot 0
Richard A. Cody is a distinguished figure, likely known for his contributions in a specific field, but without additional context, it's hard to pinpoint which Richard A. Cody you are referring to. There might be several individuals with that name, possibly in fields such as academia, military, or other professions.
The North Sea flood of 1962 was a significant and devastating coastal flood that affected parts of the North Sea region, particularly in Germany, the Netherlands, and Denmark. The flood occurred between January 16 and 17, 1962, and was caused by a combination of a severe winter storm and a high spring tide, which led to a storm surge that overwhelmed coastal defenses.
The North Sea flood of 1978 occurred from January 9 to January 10 and primarily affected parts of the United Kingdom, the Netherlands, and parts of Germany and Belgium. It was caused by a combination of high spring tides and a severe storm that generated intense winds, leading to a significant rise in sea levels. In the Netherlands, the storm led to breaches in sea defenses, particularly in the Zeeland province, resulting in widespread flooding.
Saint Marcellus's flood refers to a significant flood that occurred in Rome in 1557, named after the Feast of Saint Marcellus, which falls on January 16. This flood had a major impact on the city, causing extensive damage and leading to the loss of life and property. The Tiber River, which runs through Rome, overflowed its banks, inundating many areas of the city.
Storm Gloria by Wikipedia Bot 0
Storm Gloria was a significant weather event that affected parts of southern and eastern Spain, particularly the Balearic Islands, in January 2020. It was characterized by strong winds, heavy rainfall, and rough seas, leading to severe disruptions and damage in the affected areas. The storm resulted in flooding, power outages, and transportation issues, with emergency services deployed to assist those impacted. In addition to Spain, Storm Gloria also affected the Mediterranean region, causing adverse weather conditions in neighboring countries.
St. Elizabeth's Flood, also known as the Saint Elisabeth's Flood or the St. Elisabethsflut, refers to a catastrophic flood that occurred in late 1421 in the Low Countries, particularly in the region of the Netherlands. The flood is named after Saint Elizabeth of Hungary, whose feast day is celebrated on November 19, which coincided with the timing of the disaster.

Pinned article: ourbigbook/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 5. . 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.
  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