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Mar 20, 2026, 04:09 AM
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How many phase changes of matter are there?
📌 A phase change or phase transition is a change between solid, liquid, gaseous, and sometimes plasma
📌 The main factors that cause phase changes are changes in temperature and pressure. the two states of matter have identical free energies and are equally likely to exist.
❗️ There are 8️⃣ phase changes between solids, liquids, gases, and plasma.
Melting (Solid→Liquid)
Freezing (Liquid→Solid)
Vaporization or Evaporation (Liquid→Gas)
Condensation (Gas→Liquid)
Deposition (Gas→Solid)
Sublimation (Solid→Gas)
Ionization (Gas→Plasma)
Deionization or Recombination (Plasma→Gas)
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A solid can melt into liquid or sublimate into gas.
A liquid can freeze into a solid or vaporize into a gas.
A gas can deposit into a solid, condense into a liquid, or ionize into plasma.
Plasma can deionize or recombine to form a gas.
ℹ️ There are additional phase changes in condensed matter physics or
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Mar 20, 2026, 04:09 AM
states of matter that exist under extreme conditions
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Mar 20, 2026, 04:09 AM
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What is a state of matter? ✔️ Matter is anything that has mass and takes up space. It consists of subatomic particles, atoms, ions, and compounds. Sometimes these particles are tightly bound and close together, while other times particles are loosely connected…
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Mar 20, 2026, 04:09 AM
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How did a prehistoric bird use its teeth?
When the first fossil of Longipteryx chaoyangensis was found in 2020, paleontologists thought its toothed beak suggested it ate fish. Scientists initially compared the ancient bird to the contemporary kingfisher because of its similarly-shaped skull and beak, and diet of small fish, but that resemblance turned out to be a red herring.
https://www.cell.com/current-biology/abstract/S0960-9822(24)01124-2 inside a specimen’s stomach showed the bird — which lived 120 million years ago in — fed on fruit-like plants.
Longipteryx had disproportionately large teeth toward the front of the beak, and the thickness of those teeth’s enamel resembles that of a hyper-carnivore, akin to like Allosaurus. Now, scientists suppose that those features weren’t meant for eating, and Longipteryx was using its head as a weapon, just like modern wield their long, narrow beaks as air-born swords to fight off competition for food.
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Mar 20, 2026, 04:09 AM
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What is a state of matter?
✔️ Matter is anything that has and takes up space. It consists of subatomic particles, atoms, ions, and compounds. Sometimes these particles are tightly bound and close together, while other times particles are loosely connected and widely separated.
✔️ States of matter are forms in which matter exists, they describe the qualities displayed by matter. Basically, the state of matter of a substance depends on how much energy its particles have.
✔️ It’s possible to change the of matter by altering its temperature or pressure, causing matter to transition from one state to another. But, when matter changes state, its chemical identity remains the same. For instance, if you take ice, melt it, and then boil it, its state of matter changes, but it’s always water.
✔️ that are observable in everyday life, but scientists are discovering new states of matter that exist under extreme conditions.
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Mar 20, 2026, 04:09 AM
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How did the largest pterosaurs fly?
Pterosaurs were the first vertebrates that evolved powered flight, but it has long been debated whether the largest pterosaurs could fly at all.
Scientists were lucky to find in Jordan three-dimensionally preserved bones of two different large-bodied azhdarchoid pterosaur species. These https://www.tandfonline.com/doi/full/10.1080/02724634.2024.2385068#abstract that not only could the largest pterosaurs take to the air, but their flight styles could differ too.
Newly collected bones of the already-known giant pterosaur, Arambourgiania philadelphiae, with 10-meter wingspan resemble wing bones of modern vultures, whose flight style is soaring (sustained powered flight requiring launch and maintenance flapping).
A new, smaller species Inabtanin alarabia with circa 5-meter wingspan had flight bones that are similar to those of modern flapping birds. it is likely that Inabtanin flew this way (although this does not preclude occasional use of other flight styles too).
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Mar 20, 2026, 04:09 AM
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What was the most spectacular vacuum experiment?
📍 The most spectacular vacuum experiment was performed by a German scientist Otto von Guericke (1602-1686), the inventor of the air pump. In 1654, he evacuated the air from inside a pair of joined metal hemispheres and attached a group of horses to each end. The external air pressure that acted on the hemispheres was so strong that even 30 animals could not pull them apart ⬆️.
📍 The first artificial vacuum was produced in 1643 by an Italian physicist and mathematician Evangelista Torricelli (1608-1647), a pupil of (1564-1642). Torricelli used the vacuum in his invention of the mercury barometer. He filled a glass tube (with one end sealed off) with mercury and then immersed it in a basin of the liquid metal. An empty space formed at the upper end of the tube, the size of which varied depending on the air pressure, which led Torricelli to assume that it has to be a void.
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Mar 20, 2026, 04:09 AM
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Can a vacuum be totally empty?
📌 A vacuum is a volume empty of matter, sometimes called ‘free-space’.
❗️ In practice, only partial vacuums are possible.
📌 Outer space can approach the requirements of a vacuum, but even there are a few atoms per cubic meter.
📌 is not a force. Though the net motion of matter from a region of higher to lower concentration does appear to be due to a force – e.g. inside gas concentration is about 20% lower than ambient, so air and dust will be ‘sucked’ in.
✍️ Contrary to popular belief, a vacuum cannot be made simply by sucking the molecules out of the container space. Molecules move in every direction and bounce, and to get the molecules out, one needs to wait until they come towards you out of their own ‘free will’, and then ‘bat them’ out of the enclosure using a high speed propeller called a turbo pump. It is often necessary to use more than one type of pump to achieve a reasonably good vacuum!
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Mar 20, 2026, 04:09 AM
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What is the concept of Ahimsa?
🔺 The concept of Ahimsa is an ancient Indian principle of non-violence, non-injury or absence of desire to harm any life forms.
🔺 Ahimsa originated in Jainism, an Indian religion, and is also an important principle in Buddhism, Sikhism, and .
🔺 Mahatma Gandhi’s philosophy of non-violence was also profoundly influenced by Ahimsa.
ℹ️ 🗓 No wonder that World Compassion Day (WCD), an annual observance held on November 28, originated in India. WCD was founded in 2012 by Pritish Nandy, an Indian poet, journalist, film producer, media and television personality, politician, and activist. While many serve as moments of reflection, WCD stands out by inspiring individuals and influential personalities worldwide to act, to speak on their beliefs, aligning non-violence and compassion with the trials and tribulations of the contemporary era. The first WCD was held in Mumbai and was dedicated to animal welfare.
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Mar 20, 2026, 04:09 AM
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Why may food taste weird in space?
📌 Despite being given carefully designed diet plans ⬆️, astronauts have reported that meals taste bland and that they were not meeting their nutritional needs, which can be dangerous for long-term missions. Astronauts typically only meet about 80% of their needs in space.
📌 Scientists already knew that low-gravity causes fluid to shift from the lower to the upper parts of the body, creating facial swelling and nasal congestion which affects smell and taste. But these symptoms begin to disappear within a few weeks.
📌 https://ifst.onlinelibrary.wiley.com/doi/10.1111/ijfs.17306 that spatial perception can play a significant role. A greater sense of loneliness and isolation — which astronauts may experience in space — can influence how people smell and taste their .
📌 One of the long-term aims of the study is to make better tailored foods for astronauts, as well as other people who are in isolated environments, to increase their nutritional intake closer to 100%.
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