Crystal growth
Crystals grow in a special way. Little bits join together. They make a shape. This shape is very strong. It can stay the same. It does not change easily. Can you find a crystal?
Early Reader · Change the reading level on the articlePhysical Science articles — Page 23
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 23 of 57
Crystallite
Many things are made of tiny bits. These bits are called grains. They are very small. You cannot see them with your eyes. They join together to make rocks and metal. They help make things strong. Can you find…
Early Reader · Change the reading level on the articleCrystallographic defect
Tiny bits make up everything. Most bits sit in neat rows. Sometimes a bit is missing. Sometimes a new bit moves in. This makes a tiny break in the pattern. Can you find things with breaks?
Early Reader · Change the reading level on the articleCrystal optics
Light can act in many ways. Some things change how light moves. It can move fast or slow. This happens in a crystal. It is fun to see! Can you find a shiny stone?
Early Reader · Change the reading level on the articleCrystal polymorphism
Some things can change shape. They stay the same inside. But they look different. They can be hard or soft. This helps us make things like food or medicine. Can you find a shape?
Early Reader · Change the reading level on the articleCrystal structure
Tiny bits make a pattern. They line up in a row. They repeat to make a shape. This shape is a crystal. It helps things stay strong. Can you find a crystal?
Early Reader · Change the reading level on the articleCrystal system
Tiny parts build crystals. They fit together in patterns. Some patterns look like cubes. Other patterns look like long tubes. These shapes help us know what they are. Do you like shapes?
Early Reader · Change the reading level on the articleCrystal violet
This is a bright purple dye. It can color things like paper and pens. It can also help doctors see tiny germs. This helps us stay healthy. Do you like the color purple?
Early Reader · Change the reading level on the articleC. T. R. Wilson
A man named Wilson studied clouds. He looked at them in the sky. He made a tool to see tiny things. This tool helped us learn a lot. It is very cool! Do you like looking at clouds?
Early Reader · Change the reading level on the articleCubic crystal system
Some tiny things make cube shapes. They look like little boxes. These boxes build big rocks. They can even make gold. It is fun to see them. Can you find a cube?
Early Reader · Change the reading level on the articleCubic metre
We use a special way to measure space. It is like a big box. This box has sides that are all the same. It can hold a lot of water. This helps us know how big things are. Can you find a big box?
Early Reader · Change the reading level on the articleCubic metre per second
We can measure how water moves. It tells us how much flows by. It can show how fast a river goes. This helps us know about our world. It is very cool to learn. Can you see a river flow?
Early Reader · Change the reading level on the articleCupronickel
This metal looks like silver. It is made of copper and nickel. It does not rust in salt water. We use it for big boats. It is also used for coins. Do you have any silver-colored coins?
Early Reader · Change the reading level on the articleCurie temperature
Some things are magnets. They can pull on metal. But heat can change them. If they get too hot, they stop being magnets. This happens at a special heat level. Can you find a magnet? It is fun to learn!
Early Reader · Change the reading level on the articleCurie (unit)
A curie is a way to measure energy. It tells us how much energy is coming off. Some things have a lot of it. This helps doctors stay safe. It can also help them heal people. Can you imagine that much energy?
Early Reader · Change the reading level on the articleCurrent density
Tiny bits of power flow through wires. They move through a small space. Some wires have many bits. Some wires have only a few. If too many bits move, the wire gets hot. It might even melt! We must keep wires safe. Do…
Early Reader · Change the reading level on the articleCurrent source
A current source moves power. It keeps the flow the same. The flow does not change. This helps our tools work well. It is a neat way to use power. Do you like to see how things work?
Early Reader · Change the reading level on the articleCurved spacetime
Space and time are like a shape. Big things like Earth change this shape. This change makes things fall down. It is how gravity works. It helps us stay on the ground. Can you feel gravity pull you?
Early Reader · Change the reading level on the articleCyanogen
This is a clear gas. It can be found in space. It is in the tails of comets. It can make a blue flame. It is not safe to breathe. We must stay away from it. Have you seen a comet?
Early Reader · Change the reading level on the articleCyclic compound
Some tiny things form a ring. These rings are made of small parts. They can be in you and me. These rings help our bodies work. They are all around us. Do you see rings in nature?
Early Reader · Change the reading level on the articleCyclic voltammetry
Scientists use a special test. They change the power in a liquid. This helps them see how things work. It can look like a little duck. It helps us learn a lot. Do you want to see more?
Early Reader · Change the reading level on the articleCycloaddition
Small parts join to make a ring. They link together like a chain. This makes a new shape. It helps us build things. It is very neat. Can you see the ring?
Early Reader · Change the reading level on the articleCycloalkane
Some tiny things make a ring. They look like a circle. They are made of small parts. These parts hold hands. This helps make things like gas for cars. It is very neat! Can you see the ring shape?
Early Reader · Change the reading level on the articleCyclobutane
This is a tiny gas. It is shaped like a ring. It can look like a butterfly. Some tiny living things use it. It helps them stay safe. It is very small. Can you see the ring shape?
Early Reader · Change the reading level on the articleCyclohexane
This is a clear liquid. It smells like soap. We use it to make nylon. Nylon helps make clothes for you. It is very useful. Do you know what nylon is made of?
Early Reader · Change the reading level on the articleCyclohexane conformation
Tiny things can change shape. Some look like a chair. Others look like a boat. They move and flip around. This helps them stay safe. It is like a dance. Can you see the chair shape?
Early Reader · Change the reading level on the articleCyclopentane
This is a clear liquid. It smells like gas. It helps keep food cold. It is inside some fridges. It can catch fire fast. We must be very careful. Do you like cold food?
Early Reader · Change the reading level on the articleCyclopropane
This is a tiny gas. It looks like a small triangle. It can catch fire fast. Doctors used it to help people sleep. We do not use it much now. Can you see the triangle shape?
Early Reader · Change the reading level on the articleCyclotron radiation
Tiny bits of matter move in circles. They move when a magnet pulls them. This makes a special kind of light. We can see this light in space. It helps us learn about far places. Can you see the bright stars?
Early Reader · Change the reading level on the articleD'Alembert's principle
Things can move in many ways. A man named Jean found a rule for this. It helps us see how things move. It makes math easier for us. We can use it to learn. Do you like to see things move?
Early Reader · Change the reading level on the articleDamping
Things that bounce can slow down. A spring might go up and down. Then it stops moving. This helps things stay still. It can even help a door close. Do you see things stop moving?
Early Reader · Change the reading level on the articleDaniel C. Tsui
Daniel was a great thinker. He studied how tiny things work. He won a very big prize. This prize was for his smart work. His work helps us learn. He is a hero of science. Do you like to learn new things?
Early Reader · Change the reading level on the articleDaniel Gabriel Fahrenheit
Daniel made tools to measure heat. He made a way to tell how hot it is. This helps us know the weather. It also helps doctors. His way is still used today. Do you know how warm it is outside?
Early Reader · Change the reading level on the articleDarkness
Darkness is when there is no light. It happens when the sun goes away. Things look dim when it is dark. Our eyes work hard to see. We use light to find our way. Do you like the night sky?
Early Reader · Change the reading level on the articleDarmstadtium
Scientists made a new thing. It is a tiny bit of matter. It was made in a city in Germany. It does not last long. It goes away very fast. Can you imagine something that disappears so quickly?
Early Reader · Change the reading level on the articleDavid Brewster
David was a man who loved light. He made toys like the kaleidoscope. He also made tools to see in 3D. These tools help us see the world. He helped make lighthouses better too. Do you like bright colors?
Early Reader · Change the reading level on the articleDavid Gross
David Gross is a smart man. He studies how small things work. He won a very big prize. This prize is for his hard work. He helps us learn about our world. Do you like to learn new things?
Early Reader · Change the reading level on the articleDavid J. Wineland
David Wineland is a smart man. He studies tiny bits of matter. He uses light to help them move. His work helps us tell time. He won a very big prize. Can you learn about science too?
Early Reader · Change the reading level on the articleDavid Lee (physicist)
David Lee is a smart man. He studies how things work. He found a new way for liquids to move. This helped us learn about the world. He won a big prize for his work. Do you like to learn new things?
Early Reader · Change the reading level on the articleDavid Thouless
David Thouless was a smart man. He studied how things are made. He learned about tiny parts of matter. This work helped us learn a lot. He even won a big prize. Do you like to learn new things?
Early Reader · Change the reading level on the articleDavisson–Germer experiment
Tiny bits of matter can act like waves. Scientists shot tiny bits at metal. The bits bounced in a special way. This showed that matter can move like a wave. It helps us learn how the world works. Do you want to see more?
Early Reader · Change the reading level on the articleDawn
Dawn is the start of the morning. It is when the sky gets light. The sun is still hiding. This light helps us see things. The sky can look blue or orange. Do you like to watch the sun rise?
Early Reader · Change the reading level on the articleDaylight
Daylight is the light from the sun. It comes when the sun is up. This light helps us see. It can be bright or dim. Even clouds change the light. Do you like the bright sun?
Early Reader · Change the reading level on the articleD-brane
Tiny strings can end on a flat sheet. This sheet is called a brane. It can be a dot or a line. It can even be a big wall. These sheets help make our world. Do you think we live on one?
Early Reader · Change the reading level on the articleDDT
Some people made a tool to stop bugs. It was used to stop sick bugs. This helped keep people safe from sickness. But it could hurt the land and animals. Now we use other ways to stay safe. Do you know how we stop…
Early Reader · Change the reading level on the articleDe Broglie–Bohm theory
Tiny bits of stuff move in a special way. A wave helps guide them. The wave acts like a path. It shows them where to go. This helps us see how things work. Do you like to see how things move?
Early Reader · Change the reading level on the articleDebye length
Tiny bits of power live in many things. They can hide behind other bits. This hiding keeps the power from spreading too far. It is like a soft shield. It helps things stay calm. Can you find tiny bits at home?
Early Reader · Change the reading level on the articleDecade
A decade is ten years. It is a long time. You can use it for your life. You can use it for years. It helps us count time. We can look back at old times. How many years have you lived?
Early Reader · Change the reading level on the article