Quantum nonlocality
Tiny bits of stuff can be linked. They can be far apart. When one bit changes, the other bit changes too. This happens fast! It is a big mystery. Do you want to learn more?
Early Reader · Change the reading level on the articlePhysical Science articles — Page 47
Explore matter, energy, chemistry and the physical laws that help explain everyday life. Choose an article below; its reading controls let you move between the available levels.
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Quantum number
Tiny bits of matter have rules. These rules tell us where they go. They act like a map. This map helps us learn. We can see how they work. Do you like to learn about tiny things?
Early Reader · Change the reading level on the articleQuantum potential
Tiny bits move in strange ways. A hidden force helps them move. This force acts like a guide. It shows them where to go. It helps the whole world stay together. Does that sound cool to you?
Early Reader · Change the reading level on the articleQuantum state
Tiny things have a special way of being. We cannot know everything about them. We can only guess what they might do. This helps us learn about our world. It is very neat! Can you imagine being so tiny?
Early Reader · Change the reading level on the articleQuantum superposition
Tiny things can be in two ways at once. They can be here and there. This helps new computers work. It also helps plants grow. It is very strange! Can you imagine being in two places?
Early Reader · Change the reading level on the articleQuantum vacuum state
Empty space is not truly empty. Tiny things pop in and out of it. They happen very fast. This can even move things! It is a big secret of our world. Can you imagine empty space being busy?
Early Reader · Change the reading level on the articleQuark model
Tiny bits make up everything. These bits are called quarks. They join together in groups. Some groups make things like protons. These small bits stay stuck together. They are very hard to see. Can you imagine tiny bits?
Early Reader · Change the reading level on the articleQuasiparticle
Tiny bits move in a group. They act like one big bit. This helps us see how they work. It makes hard things easy to learn. It is like a team of friends. Can you see the team?
Early Reader · Change the reading level on the articleQuasistatic process
Things can change very slowly. Imagine a gas moving in a box. It moves so slow it stays even. This helps us know how it feels. It makes science easier to see. Can you move very slowly?
Early Reader · Change the reading level on the articleQuaternary ammonium cation
Some tiny things help keep us clean. They are in soaps. They are in hair soap too. They help kill bad germs. They can help make clothes soft. Do you use these at home?
Early Reader · Change the reading level on the articleQuenching
We can make metal strong. First, we heat it up. Then we cool it fast. We use water or oil. This makes the metal hard. It helps make tools. Do you like tools?
Early Reader · Change the reading level on the articleQuintessence (physics)
Space is growing very fast. A special force helps it grow. This force can change over time. It is like a push. It makes the world much bigger. Can you see the stars?
Early Reader · Change the reading level on the articleRacemic mixture
Some tiny things have two shapes. One looks like a left hand. One looks like a right hand. They are a mix of both. This mix is called a racemate. Can you find your own hands?
Early Reader · Change the reading level on the articleRacemization
Some tiny things come in two shapes. They can look like mirror twins. One shape might help us. The other might not. Sometimes they mix together. This makes a new mix. Can you find twins in your house?
Early Reader · Change the reading level on the articleRadial velocity
Stars move in space. Some stars move away from us. Some stars move toward us. We can see this by looking at light. This helps us find new planets. Do you like looking at stars?
Early Reader · Change the reading level on the articleRadiance
Light can look very bright. It comes from many things. Some things shine a lot. This helps your eyes see. It is a cool thing to watch. Do you like bright lights?
Early Reader · Change the reading level on the articleRadian per second
Things can spin around. We can measure how fast they spin. This helps us know how much work they do. It is a way to talk about speed. Can you see things spin? Do you like to watch wheels go round?
Early Reader · Change the reading level on the articleRadiant flux
Light moves in a steady flow. It can bounce or move through things. This flow of light is power. It helps us see the world. It is a bright thing to watch. Can you see the light?
Early Reader · Change the reading level on the articleRadiation pressure
Light can push on things. It is a tiny push. You cannot feel it. But it works in space. It can push a ship. It even moves comets. Can you see the light push?
Early Reader · Change the reading level on the articleRadiative transfer
Light and heat move through space. They travel in beams. Some light is lost. Some light is added. This helps things stay warm. It is how the sun helps us. Can you feel the sun's heat?
Early Reader · Change the reading level on the articleRadical polymerization
Tiny bits join to make big things. These bits grow in a long line. One bit starts the chain. Then more bits add on. This makes many new things. We use these things every day. Can you find something made this way?
Early Reader · Change the reading level on the articleRadioactive source
Some things give off tiny bits of energy. These can help doctors fix sick people. They can also help make paper. We keep them in strong metal boxes. This keeps us safe. Do you want to learn more?
Early Reader · Change the reading level on the articleRadioanalytical chemistry
Some tiny things give off power. Scientists look for these things. They use tools to find them. This helps us stay safe. It is very neat work. Do you want to learn more?
Early Reader · Change the reading level on the articleRadio frequency
Some power moves very fast. It travels through the air. This helps us talk to others. It can also help us see things far away. It is a special kind of energy. Can you hear a radio?
Early Reader · Change the reading level on the articleRadiometric dating
Rocks and old things have a secret. They hold tiny bits that change. These bits work like a clock. They tell us how old a rock is. This helps us learn about Earth. Can you find an old rock?
Early Reader · Change the reading level on the articleRadiometry
We can measure light. Light moves through space. It can help us see stars. It also tells us how hot things are. This helps us learn about our world. Can you see the light?
Early Reader · Change the reading level on the articleRad (radiation unit)
A rad is a way to measure energy. It tells us how much energy hits something. This can be air or water. It can even be your body. We use it to stay safe. Do you want to learn more?
Early Reader · Change the reading level on the articleRaman spectroscopy
Special light helps us see tiny things. We shine a bright beam on them. The light bounces back in a new way. This tells us what the tiny things are. It is like a secret code. Can you find the secret code?
Early Reader · Change the reading level on the articleRankine cycle
Heat makes water turn into steam. This steam moves a big wheel. The wheel makes power for us. Then the steam turns back into water. It starts all over again. Can you see how it works?
Early Reader · Change the reading level on the articleRankine scale
A man named Rankine made a way to measure heat. It helps us know how hot things are. This way of measuring is used by people who build things. It works with other ways we talk about heat. It is a very smart tool. Do…
Early Reader · Change the reading level on the articleRapidity
Things can move very fast. We use a special way to measure speed. It helps when things move near light. It makes math easy to do. It is a smart way to see motion. Do you like to go fast?
Early Reader · Change the reading level on the articleRare-earth barium copper oxide
Some special things can carry power. These things help make strong magnets. They can even help make new energy. This helps us build big tools. It is very cool! Do you like magnets?
Early Reader · Change the reading level on the articleRare-earth element
Some metals are hard to find. They hide inside rocks. These metals help make phones. They also help make big wind fans. They are very useful to us. Do you use a phone?
Early Reader · Change the reading level on the articleRate-determining step
Some things happen in steps. One step is very slow. This slow step sets the speed. It is like a slow car in a line. The slow car makes everyone wait. Can you find something slow today?
Early Reader · Change the reading level on the articleRate equation
Things in science change at different speeds. Some things happen fast. Some things happen slow. We can use math to see how. This helps us know what will happen next. It is like a clock for science. Can you find…
Early Reader · Change the reading level on the articleRayleigh problem
A flat plate moves in water. It starts to move fast. The water moves with it. This makes a flow. It helps us learn about water. We can see how it works. Can you see the water move?
Early Reader · Change the reading level on the articleRayleigh scattering
The sky looks blue. Light hits tiny bits in the air. This light bounces around. The blue light bounces the most. This makes the sky blue. Does the sky look blue to you?
Early Reader · Change the reading level on the articleRaymond Davis Jr.
Raymond Davis Jr. was a smart man. He studied how the sun works. He found tiny things from the sun. This work helped us learn a lot. He won a big prize for it. Do you like to learn about space?
Early Reader · Change the reading level on the articleRay (optics)
Light travels in lines. We call these lines rays. A ray shows where light goes. It can hit a wall and bounce. It can also go through glass. This helps us see things. Can you see the light?
Early Reader · Change the reading level on the articleReaction coordinate
Things change in many ways. Small bits move to make new things. They follow a path. This path shows how they change. It helps us see the way. Can you see how things move?
Early Reader · Change the reading level on the articleReaction intermediate
Things change in small steps. Sometimes a new thing forms first. It does not stay for long. It quickly turns into something else. This helps make the final thing. It is like a middle step. Can you see how things change?
Early Reader · Change the reading level on the articleReaction (physics)
Things push on each other. When you push a wall, it pushes back. If you jump, the ground pushes you up. This helps you move. It is how the world works. Can you feel a push today?
Early Reader · Change the reading level on the articleReaction quotient
Things in a mix can change. They can turn into new things. We can count how much is there. This helps us see what happens next. It is like a tiny puzzle. Can you see how things change?
Early Reader · Change the reading level on the articleReaction rate
Some things change fast. A fire can grow very quick. Other things change slow. Iron can rust over many years. This is how fast things change. It can be fast or slow. Do you see things change?
Early Reader · Change the reading level on the articleReaction rate constant
Small bits of stuff can change. They can mix to make new things. Some things change fast. Some things change slow. This helps us know how fast it happens. We can study this! Can you find things that change?
Early Reader · Change the reading level on the articleReactivity (chemistry)
Some things like to change. They mix with other things. This makes energy. It can make heat. It can even make light. This helps make new things. Do you like to see things change?
Early Reader · Change the reading level on the articleReactivity series
Some metals are very busy. They like to change. Some metals react with water. Others react with air. This helps us find them. Can you name a metal?
Early Reader · Change the reading level on the articleReagent
Some things help make a change. Scientists add them to a mix. This makes a new thing happen. It can even change the color. It helps us learn about the world. We use them to test things. Can you find something that…
Early Reader · Change the reading level on the article