➕Math Lab ➕
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Channel Posts
Kalamsat was the smallest satellite ever launched, which weighed a mere 64 grams and measured 3.8 cm on each side.
It was designed by an 18-year-old Indian student named Rifath Sharook and launched on June 22, 2017, through NASA's sounding rocket from Wallops Island.
It was named after former Indian President Dr. A. P. J. Abdul Kalam. Its main goal was to test the performance of 3D-printed structures in space and measure space radiation. The total suborbital flight lasted 240 minutes.
✅ Follow @math
| 2 |  A black hole is not defined only by darkness. Its mass sets the scale of its horizon, its quantum temperature, and the amount of entropy it can contain.
For a non-rotating black hole, radius grows with mass while Hawking temperature falls as mass increases. Larger black holes are therefore colder. Entropy grows with the horizon’s area, connecting gravity, quantum theory, and thermodynamics within a single object.
✅ Follow @math | 1 073 |
| 3 |  In 1831, Michael Faraday discovered electromagnetic induction by showing that a changing magnetic field could generate an electric current. Joseph Henry independently observed the same phenomenon around the same period.
Faraday’s law captures that result mathematically: changing magnetic flux through a coil induces an electromotive force. More coil turns and faster flux changes produce a larger induced voltage.
Heinrich Lenz later described the direction of the induced current, showing that it acts to oppose the change that produced it. James Clerk Maxwell eventually incorporated Faraday’s discovery into the equations that unified electricity and magnetism.
✅ Follow @math | 1 434 |
| 4 |  We know what it does.
We still don’t know what it is.
Dark energy is one of the biggest mysteries in modern cosmology. The universe is not only expanding, its expansion is accelerating. We call whatever is responsible for this acceleration dark energy, but its true nature remains unknown.
Current observations suggest dark energy makes up roughly 68% of the universe’s total energy content. Possible explanations include a cosmological constant, a changing form of energy, or even a modification of gravity.
✅ Follow @math | 1 522 |
| 5 |  +1Two pages of Albert Einstein’s 1913 handwritten notes filled with tensor equations, Christoffel symbols, and covariant expressions from his work on gravitation.
These notes come from the period when Einstein collaborated with Marcel Grossmann on the Entwurf theory, an early non-Riemannian metric approach that preceded the final 1915 general relativity field equations.
✅ Follow @math | 1 754 |
| 6 |  Quantum computing replaces the binary logic of classical bits with quantum states. Qubits can exist in superpositions, gates manipulate their amplitudes, and entanglement links their states. Carefully designed interference changes the probability of different outcomes. Measurement then turns the quantum state into classical information.
✅ Follow @math | 2 621 |
| 7 |  Transformers come in many forms, each built for a different job.
Step-up and step-down transformers change voltage, isolation transformers electrically separate circuits, instrument transformers enable safe measurement, while single-phase and three-phase designs serve different power systems. Ferrite and toroidal cores are optimized for different operating conditions, from high-frequency electronics to efficient power conversion.
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| 8 |  The Bohr model gave us a useful picture of the atom: electrons occupying specific quantized energy levels around the nucleus. But the modern quantum picture is very different. An electron is not a tiny particle following a definite orbit like a planet around the Sun. Its state is described by a wavefunction, and the electron cloud represents the probability distribution for where a measurement may find it.
That shift was one of the biggest conceptual changes in physics. Instead of asking “What path does the electron take?”, quantum mechanics asks “What state is the electron in, and what are the probabilities of different measurement outcomes?”
The Bohr model still matters because it gets an important piece right: atomic energies are quantized. For hydrogen, its predictions for the energy levels are remarkably accurate. But the full quantum-mechanical description replaces fixed orbits with orbitals and wavefunctions.
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| 9 |  Srinivasa Ramanujan failed to make it through college, but mathematics was not the problem.
In 1904, he entered Government College in Kumbakonam on a scholarship. He became so absorbed in mathematics that he neglected his other subjects. He failed his examinations except mathematics and lost the scholarship.
He later tried again at Pachaiyappa’s College in Madras. In the First Arts examination, he passed mathematics but failed all his other subjects.
Ramanujan left college without a degree and continued studying mathematics independently.
Years later, the same mathematical work brought him to Cambridge and eventually made him a Fellow of the Royal Society.
✅ Follow @math | 2 485 |
| 10 |  The universe has been changing for 13.8 billion years, from an unimaginably hot early state to the galaxies, stars, planets, and life we see today.
This timeline follows some of the biggest transitions along the way:
✅ Follow @math | 2 412 |
| 11 |  Black surfaces absorb more sunlight because they give fewer wavelengths a way back out. White surfaces do the opposite. The colors we see are simply the wavelengths that escaped.
✅ Follow @math | 2 534 |
| 12 |  Earth is a lot more dynamic beneath our feet than it looks. It is classified by how the material behaves: rigid lithosphere, slowly flowing asthenosphere, a stronger lower mantle, liquid outer core, and a solid inner core under immense pressure.
✅ Follow @math | 2 878 |
| 13 |  Every second, Earth is moving around the Sun at nearly 30 km/s, the Solar System is orbiting the Milky Way, and the Milky Way itself is racing through space. We can't feel any of it directly. Yet motion leaves fingerprints in waves, allowing astronomers to measure the speeds of stars, galaxies, and even the expansion history of the universe.
The Doppler effect is one of the reasons we can study objects we may never visit.
✅ Follow @math | 3 044 |
| 14 |  Matter is defined by how its particles cooperate with each other. A diamond, a cloud, lightning, and some of the coldest substances ever created in a laboratory can all emerge from the same underlying ingredients. Change the temperature, energy, or quantum rules, and billions of particles begin behaving in entirely new ways.
Near absolute zero the particles can stop acting like individuals altogether. Some merge into a single quantum state, while others pair up and move collectively.
✅ Follow @math | 3 037 |
| 15 |  A lesson physics students can learn from Einstein.
Time seemed obvious until Einstein asked what it meant for two distant events to happen simultaneously. In his 1905 paper on special relativity, he showed that comparing time at different locations requires synchronized clocks, and that observers moving relative to one another do not generally agree on which distant events are simultaneous.
For a physics student, the lesson is to examine the physical meaning behind every symbol instead of manipulating equations blindly. For everyone else, it means that familiar ideas are not necessarily well understood. Sometimes progress begins with a question that sounds almost childish.
Einstein taught us to question what appears obvious.
✅ Follow @math | 2 945 |
| 16 |  The word “radiation” covers some very different physical phenomena.
An alpha particle is essentially a helium nucleus. Beta radiation consists of electrons or positrons.
Gamma rays and X-rays are electromagnetic radiation, while neutrons are uncharged particles.
That difference in what they actually are determines how they interact with matter, how far they travel, and what kind of shielding works best.
✅ Follow @math | 2 763 |
| 17 |  The discovery of pulsars in 1967 was so unexpected that their astonishingly regular signals briefly raised the possibility of an artificial origin.
Jocelyn Bell Burnell, then a graduate student, noticed the repeating pulses while examining kilometers of chart-recorder paper by hand. The source was eventually identified as a rapidly rotating neutron star, opening an entirely new field of astrophysics and revealing one of the most extreme states of matter known.
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| 18 |  Martinus Veltman needed five years to pass a university examination normally reached after three and for much of that time, physics had barely captured his interest.
He had narrowly passed his secondary-school final examination in 1948. Because of his low grades, entry into technical college was uncertain until his physics teacher personally visited his parents and urged them to send him to university instead.
At Utrecht University, Veltman found the postwar teaching uninspiring. He commuted three hours each day, later worked alongside his studies, and sometimes struggled to afford proper meals.
In his Nobel autobiography, he described the period plainly:
“After three quite mediocre years…”
Veltman admitted that he spent much of this time drifting rather than working seriously. He eventually passed the candidaats examination after five years, two years later than normal.
Then he discovered a popular book about relativity. No university teacher had previously introduced the subject to him. Excited, he obtained Einstein’s The Meaning of Relativity from the theoretical-physics institute.
“Since then I was hooked,” he later wrote.
Veltman moved from experimental work into theoretical particle physics, where he developed powerful computational methods and worked with his student Gerard ’t Hooft to establish the mathematical consistency of electroweak theory.
He shared the 1999 Nobel Prize in Physics with ’t Hooft for elucidating the quantum structure of electroweak interactions.
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| 19 |  “The miracle of the appropriateness of the language of mathematics for the formulation of the laws of physics is a wonderful gift which we neither understand nor deserve.”
Eugene Wigner
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| 20 |  How close can a moon get to a planet before gravity tears it apart?
The Roche limit is the distance within which tidal forces from a larger body can overcome a satellite’s self-gravity and disrupt it.
As the moon approaches, the planet’s gravity pulls more strongly on its near side than its far side. This difference stretches the moon. Inside the Roche limit, tidal forces can overwhelm its self-gravity, breaking it into fragments. Those fragments can spread along the orbit and form a ring.
Saturn’s rings are a spectacular example of how tidal disruption can shape planetary systems.
✅ Follow @math | 2 802 |
