Distilled water
This is very clean water. We make it by boiling water. The steam turns back into water. This leaves bits of dirt behind. It helps machines stay clean. Do you like clean water?
Early Reader · Change the reading level on the articlePhysical Science articles — Page 25
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 25 of 57
Distribution function (physics)
Tiny bits move in many ways. They can be fast or slow. They can be in many spots. This helps us see where they are. It helps us know how they move. It is like a map of bits. Can you see them move?
Early Reader · Change the reading level on the articleDivergent synthesis
Scientists can make many new things. They start with one small piece. Then they add more parts. This makes a big group of things. It helps them find what they need. It is like growing a tree. Can you imagine making…
Early Reader · Change the reading level on the articleDonna Strickland
Donna is a smart scientist. She works with bright light. Her work helps doctors fix eyes. This is very good for us. She won a big prize for it. Do you like bright lights?
Early Reader · Change the reading level on the articleDouble bond
Tiny bits hold hands to make things. Some bits hold hands twice. This makes a very strong grip. It helps build the world. It is like a tight hug. Can you see how things stay together? Do you like to build things too?
Early Reader · Change the reading level on the articleDouble-slit experiment
Light can act in two ways. It can move like a wave. It can also move like a tiny dot. This is a big mystery! We can see it happen with light. We can see it with tiny bits of matter, too. Can you imagine that?
Early Reader · Change the reading level on the articleDouglas Osheroff
Douglas is a great scientist. He studies things that are very cold. He won a big prize for his work. He also likes to take photos. This helps us learn about our world. Do you like to learn new things?
Early Reader · Change the reading level on the articleDown quark
Tiny bits make up everything. They are very, very small. These bits are in all things. They help make the atoms in you. We are all made of them! Can you feel how much you are made of?
Early Reader · Change the reading level on the articleDrying
Drying takes water away. It can use warm air. Heat helps the water leave. This keeps our food good. It makes things like wood or paper. It can even make milk powder. Do you like crunchy snacks?
Early Reader · Change the reading level on the articleDubnium
This is a special thing. It is not found on Earth. People make it in a lab. It goes away very fast. It is hard to study. Can you find it?
Early Reader · Change the reading level on the articleDuctility
Some things can stretch. Gold can stretch a lot. It does not break fast. This helps us make things. It is very useful. Can you think of something that stretches?
Early Reader · Change the reading level on the articleDuncan Haldane
Duncan Haldane is a smart man. He studies how things work. He won a very big prize. This prize is for his great work. He helps us learn about the world. Do you want to be a scientist too?
Early Reader · Change the reading level on the articleDuralumin
This is a very strong metal. It is used to build planes. It helps them fly high. It is also used for bike parts. We use it to stay safe in the air. Do you like planes?
Early Reader · Change the reading level on the articleDusk
Dusk is a dark time. It is the end of the day. The sky gets very dark. It is just before night. You might need a light to see. Can you see the stars yet?
Early Reader · Change the reading level on the articleDye laser
A dye laser uses colorful liquid. It can make many colors. This helps us study things. It is very special. Do you like bright colors?
Early Reader · Change the reading level on the articleE1cB-elimination reaction
Tiny parts move in small steps. One part leaves a group behind. Then, a new bond forms. This helps make new things. It is like a puzzle. Can you see how it works?
Early Reader · Change the reading level on the articleEcho
Sound can bounce back to you. This is called an echo. It happens when sound hits a wall. The sound travels to the wall and back. You can hear it in a big room. Can you make an echo?
Early Reader · Change the reading level on the articleEclipsed conformation
Small parts of a tiny thing can move. They can spin around like a wheel. Sometimes the parts line up close. This makes them feel crowded. This can change how they act. Do you like to spin around?
Early Reader · Change the reading level on the articleEdge of chaos
Some things stay in a middle spot. It is not too still. It is not too wild. This spot helps things change and grow. It helps life work well. Do you like to change things up?
Early Reader · Change the reading level on the articleEdith Anne Stoney
Edith Stoney was a smart woman. She studied how light works. She used special tools to help sick people. This work helped many people stay well. She was very brave. Do you like science?
Early Reader · Change the reading level on the articleEdward A. Guggenheim
Edward was a man who loved science. He studied how heat works. He wrote many books to help others learn. His work helps us understand the world. He was a very smart teacher. Do you like to learn new things?
Early Reader · Change the reading level on the articleEdward Appleton
Edward was a smart man. He studied how radio waves move. He found a layer high in the sky. This layer helps us talk far away. His work helps us use radios today. Do you like to listen to the radio?
Early Reader · Change the reading level on the articleEdward Witten
Edward Witten is a smart man. He studies how the world works. He uses math to learn big things. This helps us see the stars. He is a great teacher too. Do you like math?
Early Reader · Change the reading level on the articleEdward W. Morley
Edward Morley was a smart man. He studied how light moves. He also studied air. He worked very hard to find facts. His work helps us learn about the world. Do you like to learn new things?
Early Reader · Change the reading level on the articleEdwin McMillan
Edwin was a smart man. He studied how things work. He found a new thing in nature. It was very special. This helped him win a big prize. Do you like to learn new things?
Early Reader · Change the reading level on the articleEffusion
Air can leak out of small holes. It moves through a tiny gap. This happens when there is a lot of air inside. The air pushes to get out. It can even move a balloon. Can you see air moving?
Early Reader · Change the reading level on the articleEgyptian blue
Long ago, people made blue paint. They used sand and copper. They heated it in a hot fire. This made a bright blue color. It was used on many things. Do you like the color blue?
Early Reader · Change the reading level on the articleEhrenfest theorem
Tiny things move in strange ways. They do not follow normal rules. We can guess where they go. This helps us see how they work. It is like a math map. Can you imagine tiny things moving?
Early Reader · Change the reading level on the articleEightfold way (physics)
Scientists found many tiny bits of matter. These bits were hard to group. A man found a way to sort them. It worked like a map. This helps us learn about our world. Do you like to sort things?
Early Reader · Change the reading level on the articleEilhard Mitscherlich
Eilhard was a man who loved science. He studied how tiny things grow. He found that some things grow in the same shape. This helped us learn about the world. He was a great teacher too. Do you like to learn new things?
Early Reader · Change the reading level on the articleEi mechanism
Heat can change how things are made. Some tiny parts leave at the same time. This happens when things get very hot. It helps make new things. It is like magic! Can you feel the heat?
Early Reader · Change the reading level on the articleEinstein coefficients
Tiny bits of light move in many ways. They can jump up or down. Some light gets caught by small bits. Other light is let go. This helps us see the world. Do you like bright lights?
Early Reader · Change the reading level on the articleEinstein field equations
Big things change how space looks. Heavy things like stars bend space. This bend makes things fall. It works like a heavy ball on a soft bed. This helps us see the stars. Can you imagine space bending?
Early Reader · Change the reading level on the articleEinsteinium
This is a special metal. It was found in a big blast. It can even glow in the dark. Scientists use it to learn new things. It is very hard to make. Can you imagine a glowing metal?
Early Reader · Change the reading level on the articleEinstein–Podolsky–Rosen paradox
Two tiny bits can act like a pair. If you check one, you know the other. This can feel very strange. It helps us learn about our world. Do you like big mysteries?
Early Reader · Change the reading level on the articleEinstein solid
Things that are solid can get warm. Small parts inside move when they are hot. They move more as it gets warmer. This helps us learn about heat. It is very cool! Do you feel warm today?
Early Reader · Change the reading level on the articleElastic scattering
Tiny bits can bounce off things. They hit and then move away. The bits stay the same. They do not change. This helps us learn about the world. Can you imagine things bouncing like balls?
Early Reader · Change the reading level on the articleElectrical conductor
Some things let power move through them. Metal is a good choice. It lets power flow easily. This helps us use lights and tools. It is like a road for power. Can you find a wire?
Early Reader · Change the reading level on the articleElectrical reactance
Some parts slow down electricity. They do not get hot. They just hold the energy for a bit. Then they give it back. This helps us use power. Do you like to learn about power?
Early Reader · Change the reading level on the articleElectrical resistivity and conductivity
Some things let power flow. Metals let it move fast. Rubber makes it hard to move. This helps us use tools. It keeps us safe. Can you find metal in your house?
Early Reader · Change the reading level on the articleElectric dipole moment
Some tiny things have two sides. One side is plus. One side is minus. These sides pull on each other. This can make things twist. It is like a little tug. Can you feel a pull?
Early Reader · Change the reading level on the articleElectric displacement field
Electricity can move in many ways. It can push on things. It can also move parts inside a material. This helps us make tools work. It is very cool! Can you feel a spark?
Early Reader · Change the reading level on the articleElectric-field screening
Tiny bits of power move in clouds. These clouds hide some power. They make a shield around a center. This shield helps things stay calm. It works in many places. Can you see the shield?
Early Reader · Change the reading level on the articleElectric flux
Tiny bits of power make a field. This field moves through space. It can pass through a flat shape. The power moves like many lines. More power means more lines. This helps us see how it works. Can you feel the power?
Early Reader · Change the reading level on the articleElectric potential energy
Tiny bits of power can hide. They stay near each other. This power waits to move. It can help things work. It is a hidden force. Can you feel the pull?
Early Reader · Change the reading level on the articleElectric power
Power helps us do things. It can make lights shine. It can make things move. We get it from big plants or batteries. It helps us every day. How do you use it?
Early Reader · Change the reading level on the articleElectric susceptibility
Some things react to power. Some things can hold a charge. This helps us use light. It can even help us make lasers. This is very cool! Can you feel a spark?
Early Reader · Change the reading level on the articleElectride
Some things have tiny bits of power. These bits act like small magnets. They help make new things. These bits can turn blue. It is very cool to see. Do you like blue?
Early Reader · Change the reading level on the article