Entropy (energy dispersal)
Energy likes to spread out. It moves from one spot to many spots. It is like heat moving away. This helps things change. Can you see energy spread out?
Early Reader · Change the reading level on the articlePhysical Science articles — Page 27
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 27 of 57
Entropy of activation
Things change when they mix. Some things move fast. Some things move slow. This helps us know how. It is a big clue. Can you see how things change? We can learn so much!
Early Reader · Change the reading level on the articleEntropy of mixing
Things like to mix together. Imagine two different liquids. You take away the wall between them. Now they can move and play. They spread out to fill the space. This makes things more messy. Can you find things that mix?
Early Reader · Change the reading level on the articleEntropy (order and disorder)
Things like to move around. Some things stay in neat lines. Other things spread out and get messy. This messiness is called entropy. It helps us see how things change. Can you see things move?
Early Reader · Change the reading level on the articleEntropy (statistical thermodynamics)
Things like to move and spread out. Imagine a drop of color in water. It spreads until the water is one color. Things do not like to stay in one spot. This helps us see how the world works. Do you see things spread out?
Early Reader · Change the reading level on the articleEpoxide
Some tiny things have a ring shape. They are made of three parts. This shape makes them very busy. They help make strong glue. They also clean doctor tools. Do you like using glue?
Early Reader · Change the reading level on the articleEpoxy
Epoxy is a strong glue. It can hold things together. It is used on metal and in tools. It helps make many things. It is very tough. Do you like to build things?
Early Reader · Change the reading level on the articleEquation of state
Scientists use math to learn about stuff. They look at how hot or cold things are. They see how much space things take up. This helps us know how things work. It even helps us learn about stars! Can you think of…
Early Reader · Change the reading level on the articleEquations for a falling body
The Earth pulls things down. This pull is called gravity. It makes things fall to the ground. It helps us stay on the floor. It is a very strong pull. Do you like to drop things?
Early Reader · Change the reading level on the articleEquilibrium constant
{ "text": [ "Things in a mix can stay the same. ", "They reach a calm state. ", "This helps your body work well. ", "It helps your blood carry air. ", "It is a very cool thing. ", "Can you see how it works?" ],…
Early Reader · Change the reading level on the articleEquilibrium thermodynamics
Things like to be in balance. Heat can change how things work. This helps us do work. It can make things move. We can learn how things change. Do you like to see things stay still?
Early Reader · Change the reading level on the articleEquipartition theorem
Things like to share. Heat is a kind of energy. It moves and jumps around. All tiny parts get a fair share. This helps things stay warm. Can you feel the heat?
Early Reader · Change the reading level on the articleEquipotential
Some spots have the same pull. They can be in space. They can be in metal. This helps things stay still. It can even help a ball stay flat. It is very neat. Can you find them?
Early Reader · Change the reading level on the articleErg
An erg is a tiny bit of work. It is a very small amount of energy. It helps us measure how things move. It is a very small thing to use. We can use it to study small things. Do you like to learn about small things?
Early Reader · Change the reading level on the articleEric Allin Cornell
Eric Cornell is a scientist. He studies how things work. He found a new way to use cold. This helped him win a big prize. He still works in a lab today. Do you like science?
Early Reader · Change the reading level on the articleEricsson cycle
A special engine uses heat. It uses air to move. The air gets hot. Then the air pushes a part. This helps a ship go. It is a smart way to work. Can you see how it moves?
Early Reader · Change the reading level on the articleErnest Walton
Ernest Walton was a smart man. He loved to study science. He found a way to change tiny bits of matter. This work won him a big prize. He was a great teacher too. Do you like to learn new things?
Early Reader · Change the reading level on the articleErnst Chladni
Ernst was a man who loved sound. He used sand to see sound. The sand made pretty shapes on metal. This helps us make guitars. It is very cool! Can you hear the music?
Early Reader · Change the reading level on the articleErnst Otto Fischer
Ernst Otto Fischer was a smart man. He studied how metals work. He won a very big prize. This prize was for his work. He helped us learn many things. Do you like to learn new things?
Early Reader · Change the reading level on the articleEthyl acetate
Some liquids have a sweet smell. This liquid smells like fruit. It is used to clean nail polish. It can also help make coffee. It is in many fruits too. Do you like sweet smells?
Early Reader · Change the reading level on the articleEthylenediamine
This is a clear liquid. It has a strong smell. It helps make many things. It is used to make medicine. It is also used in dyes. Can you imagine a liquid that makes things?
Early Reader · Change the reading level on the articleEucalyptol
Some plants have a special smell. It smells very fresh. It also tastes cool. You might find it in mouthwash. It can help you feel better. Do you like fresh smells?
Early Reader · Change the reading level on the articleEugene Wigner
Eugene Wigner was a smart man. He loved math and science. He studied how tiny things work. He won a big prize for his work. His ideas helped us learn a lot. Do you like to learn new things?
Early Reader · Change the reading level on the articleEugenol
Some plants have a special scent. It smells like spice. You can find it in cloves. It also helps your teeth feel better. It is in many things we use. Can you smell spice?
Early Reader · Change the reading level on the articleEuler equations (fluid dynamics)
Water and air move in many ways. Scientists use math to see how. It shows how things flow. This helps us build fast planes. It is very cool! Can you see the air move?
Early Reader · Change the reading level on the articleEunice Newton Foote
Eunice was a smart woman. She studied the sun. She found how some air holds heat. This helps us know about our world. She was a great scientist. Do you like to learn?
Early Reader · Change the reading level on the articleEuropean Physical Journal
This is a book about science. It tells us how things work. Many old books joined to make it. It helps us learn about the world. We can read it to find out more. Do you like to learn new things?
Early Reader · Change the reading level on the articleEutectic system
Some things melt easily. You can mix two things together. This makes a new mix. It melts at a low heat. This helps us fix things. Do you like ice cream? Salt helps ice melt fast.
Early Reader · Change the reading level on the articleEvanescent field
Some energy stays very close to things. It does not travel far away. It stays near the source. This helps tools work well. It can even help us see tiny things. Can you find things with energy nearby?
Early Reader · Change the reading level on the articleEvangelista Torricelli
{ "text":“A man named Torricelli loved science. \nHe found out how air works. \nHe thought air has weight. \nThis helps us know the weather. \nHe was a very smart man. \nCan you learn about air too?”", "media": […
Early Reader · Change the reading level on the articleEvening
Evening is a time of day. It starts when the sun goes low. It is near the end of the day. It leads into the night. We can see stars soon. It is a calm time. Do you like the evening?
Early Reader · Change the reading level on the articleExcited state
Tiny bits of things can get energy. They can jump up high. This happens with light or heat. Then they quickly come back down. This is how they work. Do you feel warm in the sun?
Early Reader · Change the reading level on the articleExothermic process
Some things make heat. They let energy out. This can be heat or light. Fire is one way. It feels warm to you. It helps us stay warm. Can you feel the heat?
Early Reader · Change the reading level on the articleExothermic reaction
Some things make heat when they change. This heat can feel very warm. It can even make fires. Hand warmers use this to keep us warm. It is a neat way to use energy. Do you like being warm?
Early Reader · Change the reading level on the articleExotic atom
Some tiny bits change. They swap parts. One part goes away. A new part takes its place. This makes a new kind of atom. It does not last long. Can you imagine a tiny swap?
Early Reader · Change the reading level on the articleExotic matter
Some things are very strange. Scientists look for new things. They find bits of matter. These bits act in new ways. They might even move backwards. It is all very cool. Do you like to learn?
Early Reader · Change the reading level on the articleExperimental physics
People do tests to learn about things. They use tools to see how the world works. Some tests happen in a lab. Other tests look at the stars. This helps us know the truth. Do you like to learn new things?
Early Reader · Change the reading level on the articleExplosion
An explosion is a big burst. It happens very fast. Things move out with much force. It can be hot too. This can happen in space. It can happen on Earth. Have you ever seen a big pop?
Early Reader · Change the reading level on the articleExtended periodic table
Scientists look for new things. They want to find new pieces of matter. Some pieces might be very hard to find. They might not stay still for long. These new pieces would go in a bigger chart. Can you help us find them?
Early Reader · Change the reading level on the articleExtraction (chemistry)
We can pull things out of a mix. This helps us get what we need. You can do this with tea. Hot water pulls taste from tea leaves. It is like magic! Do you like tea?
Early Reader · Change the reading level on the articleEyepiece
An eyepiece is a small lens. It sits near your eye. It makes things look big. It helps you see far stars. It is fun to use. Do you like to look at stars?
Early Reader · Change the reading level on the articleE–Z notation
Tiny bits join to make things. Some bits stay on the same side. Some bits stay on opposite sides. This helps us name them. We use letters to show where they go. It is like a map for small things. Can you see the shapes?
Early Reader · Change the reading level on the articleFaraday cage
A metal box can block power. It keeps electricity out. This helps protect your tools. It can even stop lightning. It keeps things safe inside. Do you want to see one?
Early Reader · Change the reading level on the articleFaraday effect
Light can move in special ways. A magnet can change light. It can make the light turn. This happens in glass or water. It helps us see magnetic fields. It is like magic! Can you see the light turn?
Early Reader · Change the reading level on the articleFaraday's law of induction
Moving magnets can make power. A magnet can make electricity move. It moves through a wire. This helps us use lights and tools. We use this every day. Can you find a plug?
Early Reader · Change the reading level on the articleFaster-than-light
Light is very fast. Nothing can go faster than light. It is the fastest thing in space. This helps us know how things work. Can you imagine being that fast?
Early Reader · Change the reading level on the articleFata Morgana (mirage)
Sometimes you see things that are not there. A boat might look like a castle. It can look upside down. This happens when light bends in the air. It can look very strange. Have you ever seen a trick like that?
Early Reader · Change the reading level on the articleFathom
A fathom is for water. It measures how deep it is. You can use it to see the bottom. It is about the width of your arms. It helps boats stay safe. Do you like the deep sea?
Early Reader · Change the reading level on the article