Caryophyllene
Some plants have a special smell. This smell comes from tiny parts in the plant. It is in black pepper and cloves. It helps make food taste good. Do you like the smell of pepper?
Early Reader · Change the reading level on the articlePhysical Science articles — Page 20
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.
2,727 public articles · Page 20 of 57
Casimir effect
Empty space is not really empty. It has a tiny push. This push can move two flat plates. The plates want to move closer. It is a strange force. Can you feel it?
Early Reader · Change the reading level on the articleCatechin
Plants make a special thing. It helps them stay healthy. You can find it in tea. It is also in grapes. You can find it in cocoa too. It can taste a little dry. Do you like tea?
Early Reader · Change the reading level on the articleCathode
A battery has parts inside. One part is called a cathode. It helps power move. This helps your toys work. It is a very helpful part. Do you use batteries often?
Early Reader · Change the reading level on the articleCauchy stress tensor
Things can be pushed or pulled. This push happens inside a thing. It can be a hard rock. It can be soft clay. We can study these pulls. Do you like to squeeze play dough?
Early Reader · Change the reading level on the articleCaustic (optics)
Light makes bright shapes. These shapes happen when light hits water. They can look like wavy lines. You might see them in a glass. They look very pretty. Can you find bright light shapes?
Early Reader · Change the reading level on the articleCavendish experiment
A man wanted to weigh the Earth. He used small balls and big balls. The big balls pulled on the small ones. This made a rod move a tiny bit. This helped him learn about our world. Can you imagine weighing the whole…
Early Reader · Change the reading level on the articleCementite
Some metals are very hard. This stuff is made of iron. It also has bits of carbon. It helps hold iron together. It can be hard but also break easily. Do you like hard things?
Early Reader · Change the reading level on the articleCenter of mass
Every object has a balance point. It is a special spot. You can find it to stay steady. It helps things not fall over. It is very cool! Can you find the balance point on a toy?
Early Reader · Change the reading level on the articleCentimetre–gram–second system of units
People use different ways to measure things. One way uses small bits of length. It also uses small bits of weight. It uses seconds for time. This helps scientists study tiny things. Do you like to measure things?
Early Reader · Change the reading level on the articleCentral force
Some things pull or push from one spot. This pull goes to a center point. It can pull things in. It can also push things out. This helps things move in paths. It is a neat way to move. Can you see it work?
Early Reader · Change the reading level on the articleCentrifugal force
You feel a pull when you spin. It feels like you move away. This happens on a merry-go-round. It can happen in a fast car too. It is a funny trick of motion. Do you feel it when you spin?
Early Reader · Change the reading level on the articleCeramic capacitor
Small parts help our tools work. These parts use clay-like stuff. They hold power for machines. This helps your toys run well. We use many every year. Do you see any tools today?
Early Reader · Change the reading level on the articleCERN
Scientists work at a big lab. It is near a big city. They use huge machines to learn. These machines help us see how things work. This work helps everyone. Do you want to learn about space?
Early Reader · Change the reading level on the articleCerulean
Cerulean is a pretty blue. It looks like the sky. It can look a bit green too. Artists use it to paint. It makes their work look bright. Do you like this blue?
Early Reader · Change the reading level on the articleC. F. Powell
Cecil Powell was a smart man. He studied how tiny things move. He used special film to see them. This work helped us learn a lot. He won a very big prize. Do you like to learn new things?
Early Reader · Change the reading level on the articleChain-growth polymerization
Tiny bits join to make long lines. One bit grabs another bit. This makes a long chain. It grows very fast. These chains make things we use. We use them every day. Can you find plastic near you?
Early Reader · Change the reading level on the articleChain reaction
One thing starts a big change. It moves from one thing to the next. It is like falling dominoes. One small spark can start a fire. It can even make a huge snow slide. Can you see how it grows?
Early Reader · Change the reading level on the articleChain transfer
Tiny parts build long chains. These chains make things like rubber. Sometimes the chains stop growing. This happens when a part moves to a new spot. It makes the chains shorter. This helps us make things. Can you…
Early Reader · Change the reading level on the articleCharge conservation
Tiny bits of power are everywhere. Some are plus and some are minus. The total amount stays the same. It does not change or go away. This helps everything work. Can you feel the power?
Early Reader · Change the reading level on the articleCharge density
Tiny bits of charge live in things. They can be on a line. They can be on a flat shape. They can fill up a whole space. This helps things work. Do you feel a tiny spark?
Early Reader · Change the reading level on the articleCharles-Augustin de Coulomb
A man named Charles studied science. He lived in France. He learned how things pull or push. He also studied how dirt stays in place. His work helps us build big things. Do you like to learn how things work?
Early Reader · Change the reading level on the articleCharles Barkla
Charles was a man who loved science. He studied special light rays. These rays helped us learn about things. He won a big prize for his work. He also loved to sing songs. Do you like to sing too?
Early Reader · Change the reading level on the articleCharles-Édouard Guillaume
A man named Charles found new metals. These metals do not change in heat. They help clocks work well. This helps us tell time. He won a big prize for his work. Do you like clocks?
Early Reader · Change the reading level on the articleCharles H. Townes
Charles Townes was a smart man. He studied how light works. He helped make tools with bright beams. These tools help us see space. He even found a big black hole. He loved to learn new things. Do you like to look at…
Early Reader · Change the reading level on the articleCharles Thomas Jackson
Charles was a man who loved rocks. He studied how the earth works. He looked for copper in the ground. This helped people find new things. He won many prizes for his work. Do you like to look at rocks?
Early Reader · Change the reading level on the articleCharles Wheatstone
Charles was a smart man. He loved to learn. He made many new things. He made a tool to send messages. He also made music tools. He liked to study science. Do you like to learn new things too?
Early Reader · Change the reading level on the articleCharm quark
Tiny bits make up our world. One tiny bit is called charm. It is very small. It helps make other things. It is a part of many small things. Can you imagine something so small?
Early Reader · Change the reading level on the articleChasles' theorem (kinematics)
Things can move in many ways. Some things spin. Some things slide. You can do both at once. This is like a screw. It turns and moves forward. It is a fun way to move. Can you see a screw?
Early Reader · Change the reading level on the articleChelation
Some things act like tiny claws. They grab onto metals. They hold them tight in a ring. This helps clean water. It can even help our bodies. It is a neat trick of nature. Can you find metals in your house?
Early Reader · Change the reading level on the articleChemical composition
Everything is made of tiny bits. These bits join to make stuff. Some bits make water. They stay in a set way. This helps us know what things are. It is like a secret code. Do you want to find more?
Early Reader · Change the reading level on the articleChemical decomposition
Some things can break apart. One thing can turn into many parts. This can happen with heat. It can also happen with light. This helps keep us safe in cars. Do you see things break apart?
Early Reader · Change the reading level on the articleChemical law
Things stay the same when they change. When stuff mixes, it does not go away. The amount of stuff stays the same. This helps us know how things work. It is a big secret of our world. Can you see it happen?
Early Reader · Change the reading level on the articleChemical nomenclature
Scientists use special rules to name things. These names help us know what a thing is. They help us talk to each other. This keeps us from getting mixed up. It is like a map for science. Do you like learning new names?
Early Reader · Change the reading level on the articleChemical physics
Some people study how tiny things work. They look at small bits of stuff. They see how these bits move. This helps us know how things are made. It is very cool to learn. Do you like to see how things work?
Early Reader · Change the reading level on the articleChemical polarity
Some tiny things have two sides. One side is plus. The other side is minus. This helps things stick together. It helps things mix in water. It is very cool! Can you find water?
Early Reader · Change the reading level on the articleChemical potential
Tiny bits move to find a spot. They like to move from busy spots to quiet spots. This helps things stay calm. It is like a ball rolling down a hill. Do you see things move?
Early Reader · Change the reading level on the articleChemical process
Things can change into new things. This can happen all on its own. Sometimes we use tools to help. This helps us make many things. It can even help clean our water. It is very cool! Can you think of something that…
Early Reader · Change the reading level on the articleChemical safety
Some things we use can be unsafe. They can hurt our skin or eyes. We must be very careful with them. We use tools like masks and glasses to stay safe. This helps keep us and our world well. Do you use safe tools at home?
Early Reader · Change the reading level on the articleChemical test
Scientists use tests to find things. They look at small bits of stuff. They can find food or salt. These tests help us learn. They show us what is real. Do you like to learn new things?
Early Reader · Change the reading level on the articleChemisorption
Some things stick to a surface. They do not just sit there. They join with the surface. This makes a strong bond. It can even change the surface. This helps us make new things. Can you find things that stick?
Early Reader · Change the reading level on the articleCherenkov radiation
Some things glow a bright blue. This happens in water. Tiny bits move very fast. They move faster than light can. This makes a blue light. It looks very pretty. Do you like blue?
Early Reader · Change the reading level on the articleChirality (chemistry)
Some things have a twin. These twins are mirror images. They look like your hands. One is left and one is right. They do not fit together. This helps our bodies work. Can you look at your hands?
Early Reader · Change the reading level on the articleChirality (physics)
Some things have a special shape. They look different in a mirror. Think about your hands. One is left and one is right. They are not the same! The tiny parts of our world do this too. Do you see the difference?
Early Reader · Change the reading level on the articleChlorate
Some things can make fire burn fast. This can happen in dry places. It can even be found on Mars. It is not safe to touch. We must be very careful. Do you like to learn about space?
Early Reader · Change the reading level on the articleChlorine dioxide
This is a special kind of gas. It can also be a liquid. It helps clean our water. It also helps make paper white. It keeps our food safe. Do you like clean water?
Early Reader · Change the reading level on the articleChlorite
This is a part of a salt. It can help make paper white. It can also help make cloth bright. Some kinds are not safe to touch. We must be careful with it. Do you like white paper?
Early Reader · Change the reading level on the articleChlorofluorocarbon
Some gases help keep things cold. They were used in fridges. These gases can hurt the air high above us. We must use new things now. This helps our world stay safe. Do you like cold drinks?
Early Reader · Change the reading level on the article