The hottest Physics Substack posts right now

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3.4.1 Ohm's Law

Fields & Energy • 519 implied HN points • 03 Apr 24
🔬 Science Physics Education History Engineering Mathematics
  1. Ohm's Law shows that voltage is equal to current times resistance, which is key to understanding how electrical circuits work.
  2. Georg Simon Ohm faced a lot of criticism during his time for his ideas, but later scientists recognized his important contributions to physics.
  3. Henry Cavendish had discovered concepts similar to Ohm's Law before Ohm, but much of Cavendish's work went unnoticed because he rarely published his findings.

Epistemic Hell

Secretum Secretorum • 1768 implied HN points • 27 Jan 24
🔬 Science Health Physics Medicine Biology Research
  1. Through history, reasoning based on limited information has led to dangerous outcomes, like chronic cyanide poisoning and scurvy.
  2. Some scientific problems, like understanding heredity, have been challenging due to complexity and the need for exceptional datasets.
  3. To escape epistemic hells, radical ideas, serendipity, unlearning prior knowledge, and persistence are vital.

3.5 Summary and Conclusions

Fields & Energy • 259 implied HN points • 29 May 24
🔬 Science Physics Electromagnetism
  1. Maxwell built on the work of earlier scientists to develop his laws of electromagnetism. He connected electricity and magnetism, proving they are linked like never before.
  2. Maxwell emphasized the importance of careful experimentation and having a clear understanding of facts rather than jumping to theories. This approach helped in developing the scientific understanding of electromagnetism.
  3. Innovative ideas often face skepticism, especially from those already established in the field. Acknowledging our limitations and being open to new ideas are crucial for advancements in knowledge.

3.4.7 What is “Free Space?”

Fields & Energy • 299 implied HN points • 15 May 24
🔬 Science Physics Electromagnetism Energy Theories History
  1. Free space is a place where electromagnetic waves can travel without any barriers. It has properties that support these waves, even if it seems empty.
  2. In history, scientists debated whether something could exist in a vacuum. They realized that the vacuum still has physical qualities, leading to the idea of the 'æther' as a medium for wave propagation.
  3. Modern physics shows that even a vacuum is rich in properties, meaning it's not truly empty. We should recognize that there's always something there, supporting energy and wave movement.

4.2 Early Models of Electricity

Fields & Energy • 179 implied HN points • 19 Jun 24
🔬 Science Physics Electricity Electromagnetism Models History
  1. Electricity can be understood in two ways: as a fluid traveling through wires or as fields in the space around electric charges. This is still a big question in physics.
  2. Different cultures have unique approaches to explaining scientific concepts. For example, English physicists use hands-on models, while French scientists prefer abstract theories.
  3. Benjamin Franklin was key in shaping the idea that electricity is a single fluid. This foundational concept helps us still today in understanding electricity and electronics.
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On RFK Jr., Atrazine and WiFi. Plus a puzzle for you!

An Insult to Intuition • 1454 implied HN points • 26 Jun 23
🔬 Science Technology Medicine Research Biology Physics
  1. Kennedy discussed the potential effects of Atrazine on organisms like frogs and mammals, sparking a debate on environmental toxins.
  2. The story shared analogies between a hypothetical alien civilization and current human societal challenges, emphasizing the importance of humility and balance.
  3. There was a discussion on the perceived health risks of WiFi radiation, highlighting the need for thoughtful consideration and humility in scientific discourse.

Numlock News: January 18, 2024 • Stellar Streams, Tetrapods, Richard Feynman

Numlock News • 766 implied HN points • 18 Jan 24
🔬 Science Space Biology Data Privacy Astronomy Physics
  1. The National Baseball Hall of Fame faced a significant financial decline in revenue and attendance in 2022.
  2. Walmart's financial services became a target for scammers, leading to billions of dollars in fraud.
  3. Biologists are concerned about the extinction of tetrapod species, with around 856 currently missing and presumed extinct.

The Stars, Our Destination?

Everything Is Amazing • 1479 implied HN points • 06 Feb 24
🔬 Science Space Exploration Physics Fiction Technology Astrophysics
  1. Space exploration faces challenges like the vastness of space and technological limitations.
  2. JPL has a track record of extending mission goals for spacecraft, showcasing innovation and efficiency.
  3. Theoretical concepts like FTL drives and warp drives may be intriguing, but the feasibility remains uncertain due to scientific principles and practical challenges.

3.4.6 Permittivity & Permeability

Fields & Energy • 279 implied HN points • 08 May 24
🔬 Science Physics Electromagnetism Materials Energy Theory
  1. Permittivity describes how a material can allow electric displacement, showing the relationship between electric field and displacement. It helps us understand how electric forces behave in different materials.
  2. Permeability relates to how materials respond to magnetic fields, defining the strength of magnetic interactions. It helps in understanding the magnetic forces within various materials.
  3. Both permittivity and permeability are key concepts that link electrical physics and mechanical physics. They provide important information about how electric and magnetic fields interact with materials.

Energy in electronic circuits

lcamtuf’s thing • 2244 implied HN points • 16 Oct 23
🔬 Science Physics Electronics Energy Circuits
  1. Designing electronic circuits has become more stringent over the years due to advancements in technology.
  2. Understanding how energy travels through electronic circuits is crucial for circuit stability and efficiency.
  3. High-speed signals in electronic circuits can lead to significant energy expenditure and signal integrity issues.

Reading List for Chapter 3

Fields & Energy • 199 implied HN points • 31 May 24
🔬 Science Physics Education History Literature Technology
  1. To understand electricity and magnetism, start with accessible introductory books. These give a good overview but aren't deeply technical.
  2. For more in-depth study, look into undergraduate textbooks. They cover more complex topics and are aimed at those ready to dig deeper into the science.
  3. Supplementary texts and guides can be very useful. They often explain difficult concepts clearly and may include helpful resources like online solutions and podcasts.

3.4.8 Maxwell's Methods and Views

Fields & Energy • 219 implied HN points • 22 May 24
🔬 Science Physics Mathematics History Theories Research
  1. Maxwell used physical analogies and models to understand complex electrical and magnetic behaviors. This helped him discover important concepts like the displacement current.
  2. He believed that energy is linked to electromagnetic fields, not just to electric charges. This was a key part of his theory of electromagnetism.
  3. Despite his great contributions, some of Maxwell's ideas were not recognized during his time. His work on gases faced rejection, showing how science can overlook important discoveries.

3.4.2 Maxwell’s Original Equations

Fields & Energy • 339 implied HN points • 10 Apr 24
🔬 Science Physics Mathematics Electromagnetism Equations History
  1. Maxwell's equations describe how electric and magnetic fields interact. They show the principles of electromagnetism in a clear way.
  2. Heaviside simplified Maxwell's original equations, reducing them from twenty to four. This makes them easier to understand and use today.
  3. The concepts of electric displacement and charge continuity are central to these equations. They help us understand how electricity flows and behaves in various situations.

(Ad-free Video) What's New in Science With Sabine and Lawrence

Critical Mass • 4 implied HN points • 10 Feb 25
🔬 Science Physics Quantum Life Environment Technology
  1. A new podcast series will discuss exciting science stories every month, featuring experts Sabine Hossenfelder and Lawrence Krauss. They're both knowledgeable and will provide unique perspectives on current events in science.
  2. The discussions aim to go beyond the simple headlines and hype, offering deeper insights into topics like quantum computing, climate change, and more. This approach helps clarify complex issues that often get oversimplified in the news.
  3. The podcast emphasizes that science is a collaborative effort, showcasing how scientists debate and build on each other's ideas. This makes the podcast not just informative but also a peek into the dynamic world of scientific discourse.

3.4 James Clerk Maxwell & His Equations

Fields & Energy • 359 implied HN points • 27 Mar 24
🔬 Science Physics Mathematics Electromagnetism History Mechanics
  1. James Clerk Maxwell was a key figure in understanding electricity and magnetism. He linked these topics together, showing how they relate to light.
  2. Maxwell created a set of equations that describe how electric and magnetic fields behave. These are known today as Maxwell's equations.
  3. Maxwell built on the ideas of earlier scientists, like Gauss and Faraday, and later, Heaviside simplified his work into the four equations used today.

Will space travel force us to think dynamically about radiation harm?

Gordian Knot News • 124 implied HN points • 15 Nov 24
🔬 Science Radiation Health Biology Physics
  1. Space travel could change how we understand radiation harm. Instead of just focusing on the total dose of radiation, we might need to consider how our bodies repair damage over time.
  2. Current models for analyzing radiation risk might not be suitable for space conditions. This means we may need new methods to ensure astronaut safety during missions.
  3. NASA's practices suggest that the traditional ideas about radiation limits might be too strict. If we can adapt these rules, it could help both space travel and the use of nuclear energy on Earth.

Complex systems emerge from simple rules

Tecnica • 55 HN points • 28 Jul 24
🔬 Science Biology Physics Chemistry Emergence Complexity
  1. Complex systems can develop from just a few simple rules, like in the Game of Life. It shows how starting with basic ideas can create amazing patterns and interactions.
  2. Emergence means that new, complex properties appear from simpler components interacting together. This is true for nature, biology, and even technology like AI.
  3. Human thoughts and actions also have an emergent nature. We often wonder where our ideas come from and what rules guide our decisions.

"On Action At a Distance"

Fields & Energy • 219 implied HN points • 03 May 24
🔬 Science Physics Research Mathematics Electricity Magnetism
  1. There are debates about how forces act over distances. Some people think there's a hidden connection, while others believe that objects can directly affect each other without any medium.
  2. Here’s a fun example: when you ring a bell using a wire, the movement happens gradually, showing that actions often involve a series of connections, not just instant forces.
  3. Scientists like Faraday introduced the idea of 'lines of force' to visualize these actions. Instead of just thinking about pushes and pulls, we can now understand force as stretching and pressing through a medium.

River as a verb

The Egg And The Rock • 963 implied HN points • 21 Feb 23
🔬 Science Nature Space Physics Time
  1. A river is more than just a static object, it is a dynamic process that is constantly changing and flowing.
  2. Our language often limits our understanding of the world by categorizing things as objects rather than actions.
  3. The river is part of a larger cycle, influenced by natural forces like gravity and the sun, showing the interconnectedness of all elements in nature.

3.4.3 Gauss’s Laws

Fields & Energy • 259 implied HN points • 17 Apr 24
🔬 Science Physics Mathematics Electromagnetism History
  1. Johann Carl Friedrich Gauss was a brilliant mathematician known for his early talent, like solving a tricky addition problem in second grade. He made significant contributions to math and physics, including the development of formulas to calculate important dates, like Easter.
  2. Gauss's Law describes how electric fields and charges relate to each other. For instance, electric field lines begin at positive charges and end at negative ones, while magnetic field lines always form loops.
  3. Gauss and Wilhelm Weber worked together to measure the Earth's magnetic field. They created detailed maps of magnetic intensity that are still referenced today, showing the long-lasting impact of Gauss's work in science.

3.4.4 Ampère’s Law

Fields & Energy • 239 implied HN points • 24 Apr 24
🔬 Science Physics Electromagnetism Mathematics Research Theory
  1. Ampère’s Law explains how electric currents create magnetic fields. You can use the right-hand rule to find the direction of the magnetic field around a current.
  2. We visualize magnetic fields using 'dot-x' notation. A 'dot' shows current coming toward you, while an 'x' shows it going away, helping to understand how fields form around currents.
  3. Maxwell introduced the idea of displacement current, which means a changing electric field can create a magnetic field. This is important for understanding how electromagnetic waves travel.

3.2 Michael Faraday

Fields & Energy • 359 implied HN points • 12 Mar 24
🔬 Science Physics Electromagnetism History Innovation Experimentation
  1. Michael Faraday discovered that moving magnets can create electricity, a process called induction. This was a major breakthrough in understanding how electricity and magnetism work together.
  2. Faraday also introduced the idea of 'lines of force' to visualize magnetic fields. This concept helps us understand the direction and strength of magnetic effects.
  3. He believed scientific discoveries should come from direct observations of nature, not just complicated math. Faraday's practical experiments made him one of the great experimental physicists.

3.4.5 Faraday’s Law & Electromagnetic Waves

Fields & Energy • 219 implied HN points • 01 May 24
🔬 Science Physics Electromagnetism Light Energy
  1. Faraday's Law shows that a changing magnetic field can create an electric field. This means electricity and magnetism are like partners that can influence each other.
  2. When electric and magnetic fields change together, they can create electromagnetic waves, which is how light travels. It's like a dance between the two fields that lets energy move through space.
  3. In history, scientists like Faraday and Maxwell noticed that light might be connected to electromagnetism. They found evidence that light behaves like an electromagnetic wave, leading to important discoveries about how we understand light and energy.

The unlit space between the stars

lifeboat • 530 implied HN points • 20 Dec 23
🔬 Science Astronomy Physics
  1. Darkness can reveal different kinds of understanding and truths that are often hidden in the light.
  2. The universe is much wilder and darker than we once thought, with most matter invisible and elusive like dark matter.
  3. Dark matter, although invisible, plays a crucial role in creating stars and light, showing that the source of substance and energy is found in the unlit spaces between things.

Some Speculation on Future Computational Physics

Bzogramming • 61 implied HN points • 27 Nov 24
🕹 Technology Computing Physics AI Algorithms
  1. There are two main ways to tackle physics problems: symbolic methods that involve working with symbols directly, and numerical methods that use simpler calculations. Both have their pros and cons.
  2. Quantum mechanical problems can be very tough to solve and require immense computational power, often beyond what we currently have. Even with advancements, some problems could remain very hard for a long time.
  3. As computing develops, we should explore combining the best parts of symbolic and numerical physics. We might discover new tools and methods that make it easier to solve complex problems in the future.

3.3 Potentials, Energy, & Fields

Fields & Energy • 239 implied HN points • 20 Mar 24
🔬 Science Physics Mathematics Theory Electricity Energy
  1. There's a debate in science about how we understand forces, like whether they act at a distance or through fields in space. Two main theories exist: one says forces happen instantly, while the other suggests they spread out gradually.
  2. George Green, a self-taught baker turned mathematician, made important contributions to the math behind electromagnetism. His work, which included ideas about electric potential and field theory, changed how we study these forces.
  3. Fields and potentials are two simple ways to describe how electricity and magnetism work. They help us understand how energy moves and behaves in different situations, like around charges or between capacitor plates.

3.0 The Birth of Electromagnetism

Fields & Energy • 279 implied HN points • 28 Feb 24
🔬 Science Physics Electromagnetism History Measurement Innovation
  1. Coulomb created the torsion balance, a tool that helped him measure tiny forces between electrically charged objects. This was a big step in understanding electricity and magnetism.
  2. His findings showed that electric forces follow a similar pattern to gravitational forces, which Newton discovered. This means both types of forces can be explained using related mathematical laws.
  3. Coulomb's work laid the foundation for modern electromagnetism, even though he faced challenges during the French Revolution. His contributions are still recognized today, as the unit of electric charge is named after him.

WORM MOON 2023

The Lunar Dispatch • 648 implied HN points • 08 Mar 23
🔬 Science Physics Quantum Computing History Ethics Technology
  1. Progress in creating theoretical spacetime tunnels like wormholes has been slow.
  2. Albert Einstein, known for his scientific achievements and humanitarianism, had a complex private side.
  3. With the advent of quantum computers, concerns arise about privacy and the need for mutual forgiveness in the face of revealed dark sides.

2.6.3 The Misinterpretation of Newton

Fields & Energy • 299 implied HN points • 14 Feb 24
🔬 Science Physics Mathematics History Philosophy Theories
  1. Newton did not explain why gravity exists. He focused on describing what gravity does instead of offering guesses about its cause.
  2. Many scientists after Newton misinterpreted his ideas, leading to a belief that gravity was an essential quality of matter, even though Newton disagreed with such views.
  3. Over time, Newton's concepts became viewed as abstract ideas rather than being connected to real evidence from the physical world.

Intrigue

Remote View • 334 implied HN points • 28 Jan 24
🔬 Science Physics Research Technology Experiments
  1. The post discusses the concept of intrigue both as a verb and a noun.
  2. The post announces a livestream on January 28, 2024, at 22:00 CET, discussing thoughts from a book by Robert Temple.
  3. The post provides various references, including books, articles, and research papers on topics like science, plasmoids, and cold war technology.

A Bridging of Dimensions

ᴋʟᴀᵾs • 628 implied HN points • 15 Jun 23
🔬 Science Physics Mathematics Biology Neuroscience Consciousness
  1. Former government officials have revealed details about UFO crash retrieval programs involving non-human intelligence and advanced materials.
  2. The use of topological materials in UFO technology could explain exotic properties, like strange isotopes and materials able to deform into higher dimensions.
  3. Connections between the human brain's multi-dimensional functions and UFO phenomena could suggest a link between consciousness and unexplained aerial phenomena.

3.1 The Discovery of Electromagnetism

Fields & Energy • 239 implied HN points • 06 Mar 24
🔬 Science Physics Mathematics Electromagnetism History Experimentation
  1. Hans Christian Örsted proved that electricity and magnetism are connected by running a current near a compass, making them part of the same field called electromagnetism.
  2. André-Marie Ampère built on Örsted's work, showing that moving electric currents can attract or repel each other just like magnets do.
  3. Many scientists assumed forces acted at a distance, but Michael Faraday later suggested that closer particles must interact to create these forces.

Last-minute gravitational wave predictions, June 28th 2023, hot damn

The Egg And The Rock • 589 implied HN points • 28 Jun 23
🔬 Science Astronomy Physics Astrophysics
  1. Tomorrow there will be an announcement about predictions on gravitational waves from the International Pulsar Timing Array.
  2. Gravitational waves are ripples in spacetime caused by accelerating masses; they're detected by length changes.
  3. The International Pulsar Timing Array uses pulsars and telescopes to hunt for supermassive black hole mergers, with the potential for groundbreaking discoveries.

2.6.1 Newton’s Methods

Fields & Energy • 299 implied HN points • 31 Jan 24
🔬 Science Physics Philosophy Mathematics History Methodology
  1. Newton believed that geometry should be connected to real-world observations, rather than just logical deductions from axioms. He saw math as a tool to understand the physical world.
  2. He emphasized that we should always seek the simplest explanation for natural phenomena, following the principle of parsimony. If a simpler explanation fits the facts, it should be preferred.
  3. Newton argued that conclusions drawn from experiments should be regarded as generally true, even if new evidence could change our understanding later on. This highlights the importance of adapting our views as we gather more information.