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Absolute Zero
Coldest Possible Absolute zero is -273.15C, the lowest theoretical temperature where atomic motion stops. It cannot be reached in practice, only approached. Quantum Effects At this temperature, quantum mechanical effects dominate, such as Bose-Einstein condensation. Space Proximity Outer space is still warmer, at about 2.7 Kelvin, due to background radiation from the Big Bang.
Antimatter
Opposite Twin For every particle in the universe, there exists an antimatter counterpart with opposite charge. Explosive Reactions When matter and antimatter meet, they annihilate, converting their mass entirely into energy. Medical Uses Antimatter is used in PET scans, where positrons (antielectrons) help create detailed body imaging.
Chemical Reactions
Bond Breaking All chemical reactions involve breaking bonds between atoms and forming new ones, releasing or absorbing energy. Endo and Exo Endothermic reactions absorb heat, while exothermic ones release it - like combustion or rusting. Instant Color Chemiluminescence allows reactions to emit visible light, such as glow sticks or fireflies.
Conservation of Mass
Nothing Lost This principle states that matter cannot be created or destroyed in chemical reactions. Lavoisier's Law Discovered by Antoine Lavoisier in the 18th century, it's a foundation of modern chemistry. Closed Systems In a sealed reaction, the total mass of reactants equals the mass of products - always.
Electromagnetism
Dual Forces Electricity and magnetism are unified as electromagnetism, one of the four fundamental forces of nature. Maxwell's Equations James Clerk Maxwell's 19th-century equations explained how electric and magnetic fields propagate. Everyday Use Electromagnetic principles power motors, phones, wireless tech, and even MRI machines.
Periodic Table
Elemental Order The periodic table organizes all known chemical elements based on atomic number and properties. Mendeleev's Vision Dmitri Mendeleev created the first table in 1869 and even predicted elements yet to be discovered. Modern Discoveries Elements up to atomic number 118 (oganesson) are now confirmed, many synthesized in labs.
Quantum Tunneling
Barrier Breach Quantum particles can pass through energy barriers they theoretically shouldn't - a strange effect of quantum mechanics. Sun's Core This is how fusion occurs inside stars, where protons overcome repulsion without enough classical energy. Technology Impact Quantum tunneling enables technologies like flash memory and scanning tunneling microscopes.
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