A body submerged in a fluid loses exactly as much weight as the weight of the fluid it displaces. The bathtub overflows when you get in — it's not just an inconvenience, but a demonstration of the law.
In practice: Archimedes' principle explains the buoyancy of ships, the operation of hydrometers, and the behavior of submarines during diving and surfacing.
Archimedes of Syracuse, according to legend, discovered his principle in the bath, shouting 'Eureka!'. The principle itself: a body submerged in a fluid or gas experiences a buoyant force equal to the weight of the displaced medium. This force arises from the pressure difference: the pressure is greater at the bottom than at the top, and this difference creates a lifting force. Buoyancy is determined by the density ratio: if the density of the body is less than that of the fluid, it floats.
How it works
Ships made of steel don't sink because their volume is large and they displace a lot of water. Fish control buoyancy with a swim bladder. Balloons in the atmosphere obey a similar law, only for gases.
💡 The Dead Sea is so salty (density 1.24 kg/L versus 1.00 for fresh water) that a person effortlessly lies on the surface without sinking.
When you place an object in a fluid (water, oil, mercury), a buoyant force acts on it. It is directed upward and equals the weight of the fluid the object displaced. Density (how heavy a substance is for its size) determines whether the object sinks or floats. The denser the fluid, the greater the weight it can support.
How it works
Ships made of steel don't sink because their volume is large and they displace a lot of water. Fish control buoyancy with a swim bladder. Balloons in the atmosphere obey a similar law, only for gases.
💡 According to legend, Archimedes not only shouted but ran naked through the streets of Syracuse. Modern research shows that to detect the crown substitution, he would have needed volume measurement accuracy on the order of 0.1 ml — a difficult task without precise vessels.
Any body submerged in a fluid (gas) at rest experiences a buoyant force from this fluid (gas) equal to the weight of the fluid (gas) displaced by the body. The force is directed vertically upward and is applied at the center of gravity of the displaced volume (center of buoyancy).
Discovery
Archimedes (287–212 BC) formulated the principle in his treatise 'On Floating Bodies'. Legend says he discovered it while solving the problem of the authenticity of Hiero II's golden crown. Archimedes realized that the volume of displaced water allows measuring the volume of an irregularly shaped body and calculating its density.
How it works
Applied in shipbuilding, design of underwater vehicles, balloons, densitometers and flow meters. Limits of applicability: the law is valid for statically resting fluids and gases. In non-inertial systems or with accelerated fluid motion, corrections are needed.
Caveats
The law does not account for viscosity and surface tension, which can affect the submersion of small bodies.; In inhomogeneous fluids (e.g., with a salinity gradient), calculations become more complex.; For bodies with high entry speed into water, hydrodynamic effects must be considered.
F_{\text{выт}} = \rho g V
F_buoy — buoyant force (N), ρ — density of the fluid or gas (kg/m³), g — acceleration of gravity (approximately 9.8 m/s²), V — volume of displaced fluid (m³)
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Mass currents have now been introduced into the Diósi–Penrose wave function collapse model for the first time, adding post-Newtonian corrections from general relativity. It turns out that moving mass generates gravitomagnetic noise, causing angular momentum decoherence. The most dramatic effects app
The weak equivalence principle has been tested with fantastic precision, but always with grounded samples — as if one string of the gravitational violin is deliberately muted. The κ parameter quantifies whether acceleration depends on electric charge: it is the ratio of the difference in acceleratio
Astrophysicists have proposed a new method for hunting dark matter — not searching for the black holes themselves, but listening to the quantum echo of gravity. In regions of ionized hydrogen, tidal forces from primordial black holes split the atomic level 2P₃/₂, turning a single 9.9 GHz absorption
The diagnostic parameter \(\tilde{\alpha}\) reveals that in galaxies and clusters, the post-Newtonian approximation loses reliability due to accumulated nonlocal gravitational correlations. Its value skyrockets precisely where dark matter is traditionally invoked—and this finding could overturn our
Cosmology allows for a terrifying scenario of phantom dark energy, where the universe's expansion accelerates so violently that it tears apart galaxies, stars, and atoms. Deep-space detectors can't spot a sudden shift to this state: light from distant supernovae has traveled billions of years. So Ro
The no-go theorem dashes hopes of circumventing the wormhole paradox: no interaction with dark energy can shield against the geometric demand for 'negative pressure.' The work shows that even the most cunning models with energy transfer between matter and vacuum shatter against the relentlessness of
The main obstacle for a graviton laser is that gravitational waves cannot be reflected: they pass through any substance. The solution lies in the Gertsenshtein effect. Under a powerful magnetic field, gravity particles temporarily become photons, which are easily reflected by ordinary mirrors. The r
New research shows: wormholes with a precisely tuned throat length can cast a shadow indistinguishable from that of a Schwarzschild black hole. But numerical simulations expose a critical flaw in the disguise—the wormhole's accretion disk emits far more energetic radiation thanks to Doppler boosting
The new scheme uses a light-filled cavity where photon pairs, like sharp jolts, instantaneously transfer energy to a chain of qubit cells. Quantum links inside the cells suppress leakage, making the battery immune to noise and defects.
Researchers found that a lab-made river’s cross-section perfectly mirrors the form predicted by a cosmological equation for a negatively curved universe. Normally, this equation tracks how the Universe’s size evolves over time. Surprisingly, water sculpts its channel to maximize bottom friction, and
Quantum gravity eludes experiments due to the Planck scale. But the 2026 Gravity Research Foundation award-winning work points to a natural super-amplifier: superradiant axion clouds around rotating black holes. This cosmic mechanism generates squeezed states with up to 10⁷ correlated gravitons, cre
In a new cosmological model, the source of accelerated expansion is not a mysterious cosmological constant but the process of absorbing other universes. The merger intensity is set by a single constant g, calibrated by the local value of the Hubble constant. The computed evolution of the dark energy
On Saturn's moon Enceladus, scientists search for signs of life in the subsurface ocean. Non-living processes create similar signatures. Researchers developed a method to estimate the non-biological background and showed: without precise geophysical data, distinguishing living from non-living is imp
The new model intertwines cyclic cosmology and inflation into a single dance: two scalar fields, like blacksmith’s bellows and a valve, alternately compress and inflate the Universe. This approach not only lifts the curse of the singularity but also explains the mysterious smoothness of the cosmos,
Scientists simulated the journey of microbes inside a Martian fragment. The spores survived harsh ultraviolet radiation, and computer calculations showed the trip takes only a year. This makes the idea of interplanetary spread of life more plausible.
Scientists have revealed a universal recipe for living matter: it contains more oxygen, hydrogen, sulfur, and nitrogen relative to carbon. This pattern holds for any organism and isn't tied to specific biomolecules. The chemical signature of life is universal—future missions could search for it on o
New interval quantum mechanics describes states not as points, but as 'quantum droplets' — regions of possible values. Measurement squeezes the droplet, and paradoxes like Schrödinger's cat simply do not arise in the real, imprecise world.
Physicists have found that the shape of a water vortex's sound shadow can precisely measure its rotation speed. The main surprise: the mathematics of an ordinary sink plug and a giant black hole are the same.
Chiron releases methane from its depths, carbon dioxide from the surface, and carbon monoxide is locked inside. This reshapes models of how icy bodies behave.
Physicists have discovered that under environmental influence, a strong quantum bond between particles breaks down faster than a weak one. The reason is excess energy in highly entangled states. This counterintuitive effect helps manage fragile quantum systems.
Nature’s arteries—river systems, leaf veins—have operated flawlessly for millions of years. A new study reveals how to transfer this brilliant engineering to city roads. The result: networks that grow, adapt, and require almost no maintenance.
Traditionally, astronomers caught planets by waiting for multiple passes across stars. ExoVeil breaks this mold: a transformer neural network learns to predict the star's normal twinkling and spots even a lone shadow. A blind analysis of Kepler data revealed 179 new candidates, and on TESS data with
In the disk of TW Hydrae, resembling the early Solar System, HC5N has been detected — the longest carbon chain in such an object. The ALMA discovery shows that prebiotic compounds are not destroyed in the planetary forge. Models point to an excess of carbon, linking the disk's chemistry with interst
Neptune's third-largest moon, Nereid, was long counted among the icy intruders from the Kuiper Belt. But its unique infrared spectrum, captured by the James Webb Space Telescope, is unlike any other: crystalline water ice with a reddish tint and traces of carbon dioxide hint at a birth near the plan
A quantum system can act as an ultra-sensitive sensor, but its ultimate precision used to be calculated by fully reconstructing all properties — a laborious process. Now scientists have shown that a few simple measurements suffice: a machine learning algorithm predicts precision based on particle co
Spectral lines of erythrulose (C₄H₈O₄), caught by the Yebes 40m and IRAM 30m radio telescopes, betrayed the presence of this sugar in the cloud G+0.693. For the first time, we see how, in the interstellar medium, on the surface of icy dust grains, components of nucleic acids are born from glycolalde
In the PIRENEA ion trap, a cosmic dance was recreated: benzyl-type ions intertwine with alkylnaphthalenes, birthing a photostable acenaphthylene cation. This solves the mystery of cyanoacenaphthylene in the TMC-1 cloud and rewrites the rules for assembling aromatic compounds in the cold depths of sp
The CRIRES+ spectrograph on the Very Large Telescope captured the faint light of the young super-Jupiter TWA5B and resolved the SiO lines—the main carrier of gaseous silicon. The detection with a signal-to-noise ratio of 7.5 means: silicon almost entirely floats in the gas phase, not locked in silic
A diamond plate with magnetic particles on DNA strands analyzes liquid by the trembling of particles. Their movement changes with thickness and composition: in syrup—slow, in alcohol—fast. The diamond reads the magnetic echo and creates a precise portrait of the liquid—no reagents, no waiting.
Carbonaceous chondrites that fall to Earth carry a double isotopic signature. Measurements of silicon, iron, magnesium, and chromium tell us that the stuff of Jupiter and Saturn came from two reservoirs, with a late addition of comet dust making up more than a third. Even more surprising, CI chondri
Dark matter is physics' greatest intrigue. Paleodetection opens a new chapter: million-year-old minerals, like laurionite (PbClOH), preserve traces of dark particles. Thanks to massive lead nuclei and exceptional purity, crystals can detect the Higgsino — the superpartner of the Higgs boson, whose s
TRAPPIST-1 e is a rocky planet in the habitable zone of a red dwarf, one of astrobiologists' prime targets. But decoding its atmosphere requires a precise ultraviolet 'autograph' of the star. Simulations showed: different UV spectra dramatically alter the chemical portrait, producing deceptive pairs
Scientists have discovered that in quantum systems where conservation laws split states into isolated 'pockets,' a strong disturbance of equilibrium recovers faster than a weak one—just like hot water sometimes freezes sooner than cold. Meanwhile, some imbalances vanish in a flash, while others get
Atmospheres of many sub-Neptunes are shrouded in dense organic hazes that hide their true composition. In lab experiments, such hazes were recreated from water vapor, methane, and carbon dioxide, then irradiated with ultraviolet light, mimicking flares from red dwarfs. It turned out that after irrad
The bright flash of a bolide is just the first act. After an asteroid or comet fades, dark flight begins: the invisible drift of fragments to the ground. That's when wind sows chaos, shifting the impact point by hundreds of meters. The team of Devillepoix and Cupák deployed the WRF model to calculat
The Webb telescope directly observed heavy water ice for the first time in a planetary disk—the birthplace of planets. There's unexpectedly a lot of it, pointing to a turbulent history of the ice that might explain the origin of Earth's oceans.
Titan's dense haze long concealed its surface. But in infrared light, the JWST telescope discerned a narrow dark band — a chemical fingerprint of an unknown substance. A similar, but broader, one was found on Pluto. This discovery brings us closer to unraveling the composition of distant icy worlds.
Hundreds of rogue planets lurk on the outskirts of the Solar System. Their close encounters with Earth—even without a collision—cause waves, eruptions, and climate shifts. This explains past mass extinctions.
Astronomers studied WASP-121 b, a gas giant always facing its star with one side. As the planet transited the star, they detected changes in light absorption: the eastern limb was hotter than the western, which destroys water and leaves carbon monoxide. This opens a method for scanning weather on su
We often blame ourselves for noticing only what matches our expectations. But a mathematical model inspired by the laws of the microworld showed that this habit drastically reduces errors and requires less memory. It's not foolishness, but a calculated strategy.
A third giant planet has been found around Beta Pictoris—not in an image, but through chemical traces in light: methane, water, and carbon monoxide. It is 2–4 times more massive than Jupiter and sits so far out that a year there lasts over a century. Its gravity shapes the inner edge of the dusty di
After earthquakes or explosions, every hour counts. New research proposes using drones with incredibly sensitive quantum magnetometers to peer beneath rubble. Scientists simulated the collapse of a concrete parking structure and showed that weak magnetic fields from steel rebar can reveal where void
Between searching for life and technology, there is a gap: how to notice intelligence without machines? Noosignatures — any ordered traces of a thinking being — fill this void. From a paw print to a signal without a key: a new method expands the chances of finding alien intelligence even where life
Data from JWST and SPHEREx on comet 3I/ATLAS revealed that natural spread of life in ice is possible if microbes periodically thaw. But intentional sending of life by another civilization is nearly impossible — the impact would be too hot. The work proposes a method to search for life on such wander
Astronomers discovered exoplanet TOI-2195 A b – a hot Neptune with a mass 1.5 times that of Neptune, but a radius almost as large as Jupiter's. Orbital analysis suggests a likely polar orbit. Modeling indicates the planet may have formed as a cold Jupiter, losing up to 90% of its mass during highly
The James Webb Space Telescope has peered into a previously unseen world: the atmosphere of the giant planet WD 1856 b, orbiting a white dwarf. The transit spectrum from 0.5 to 5.0 μm revealed hydrocarbons, including methane with a significance of 17:1 to 30:1, thick aerosols, and thermal glow from
Special surfaces, optimized by computer algorithms, capture and hold the tiniest particles with the force of light. This technology is essential for ultrasensitive sensors, precise assembly of microdevices, and even manipulation of individual atoms in quantum systems.
310 light-years from Earth, astronomers have found a remarkable system: a 15 million-year-old star surrounded by two transiting gas giants with record-long orbits of 225 and 314 days. Observations with TESS, CHEOPS, and ground-based telescopes measured their radii and set upper limits on their masse
Scientists from Blue Marble Space combined geophysics, atmosphere, and rocket dynamics to find the limits of chemical escape from exoplanets. A payload of 1,000 kg — like that of the Voyager probes — was used as a benchmark. It turned out that for a planet more massive than about 11.5 M⊕, the number
The discovery of 1I/‘Oumuamua made us wonder: could some interstellar wanderers actually be our own comets, ejected from the Oort cloud and returning millions of years later? Simulations show that such ‘quasi-interstellar objects’ are indeed possible, but they have unique characteristics: extremely
A new study has, for the first time, self-consistently incorporated the recipe of double diffusion into an evolutionary code of planets and traced the fate of Jupiter and Saturn from the moment of formation. It turns out that even a thousandfold enhancement of mixing does not lead to significant sme
Spectrograph NIRSpec aboard the JWST telescope has discerned a complex mosaic of carbon dioxide and carbon monoxide bands on Ariel, Umbriel, Titania, and Oberon. Comparison with laboratory ices at cryogenic temperatures revealed signatures of crystalline CO₂, clathrates, and carbonates. The observed
The Mpemba effect, known from kitchen experiments with water, is reimagined in a quantum model. It turns out that at the level of individual particles, hot cools faster only at temperatures close to absolute zero, where quantum tunneling operates. Reverse paradoxes also emerge, unthinkable in the or