February
February is the second month. It comes after January. It has 28 days. Sometimes it has 29 days. This helps our years stay right. It is a short month. Do you like February?
Early Reader · Change the reading level on the articlePhysical Science articles — Page 28
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 28 of 57
Felix Bloch
Felix Bloch was a smart man. He studied how tiny things work. He won a big prize for his work. His ideas help doctors see inside our bodies. He was a great teacher too. Do you like to learn new things?
Early Reader · Change the reading level on the articleFermat's principle
Light likes to move fast. It takes the quickest path. This helps light reach you. We can see things because of this. It is like a fast race. Do you like to run fast too?
Early Reader · Change the reading level on the articleFermi–Dirac statistics
Tiny bits of stuff live in groups. They like to have their own space. No two bits can be in the same spot. This helps metals work. It helps stars stay big. It is very neat. Do you like tiny things?
Early Reader · Change the reading level on the articleFermi energy
Tiny bits move in a fast way. They fill up small spots. They cannot stay in the same spot. Even when cold, they zoom around. This helps stars stay big. It is a busy world! Do you like to zoom?
Early Reader · Change the reading level on the articleFermi gas
Tiny bits make up everything. Some bits like to stay apart. They push on each other. This push helps big stars stay round. It keeps them from falling in. Do you like stars?
Early Reader · Change the reading level on the articleFermi level
Tiny bits of power move in wires. We call these bits electrons. They like to move from one place to another. This movement makes things work. It helps us use lights and toys. Can you see things that use power?
Early Reader · Change the reading level on the articleFermi's golden rule
Small things can change. A tiny push can move them. This move happens at a steady speed. It helps us learn how they work. It is a very big rule. Do you want to see more?
Early Reader · Change the reading level on the articleFermi surface
Tiny bits live in all things. They fill up spots like a game. Some spots are full. Some spots are empty. This line shows where they stop. It helps us learn how things work. Can you see the shape?
Early Reader · Change the reading level on the articleFermium
Fermium is a new kind of stuff. It was found in a big blast. It was named after a smart man. We use it to learn new things. It is very hard to make. Do you want to learn more?
Early Reader · Change the reading level on the articleFerricyanide
This is a red salt. It looks like tiny red rocks. It helps make a bright blue color. This blue is used for old maps. It is not very bad for us. It is safe to use. Do you like the color blue?
Early Reader · Change the reading level on the articleFerrimagnetism
Some things act like magnets. They can pull on other magnets. Inside, tiny parts pull in two ways. One part pulls one way. The other part pulls the other way. But one side is stronger. This makes the whole thing…
Early Reader · Change the reading level on the articleFerrite (magnet)
Some things are magnets. They can pull on metal. You might see them on a fridge. They help things like speakers work too. These magnets are made of special clay. Do you have a magnet at home?
Early Reader · Change the reading level on the articleFerrocene
Some tiny bits make an orange powder. It looks like a sandwich. An iron part is in the middle. Two rings sit on top and bottom. It is very strong. It does not break easily. Can you find something orange today?
Early Reader · Change the reading level on the articleFerrocerium
Some metals make bright sparks. You can see them in lighters. You strike them to make fire. This helps you stay warm. It is very useful. Do you like bright sparks?
Early Reader · Change the reading level on the articleFerrocyanide
This is a special part of iron. It can make a bright blue color. It helps keep some foods from clumping. It can also help make clean energy. It is very useful. Do you like the color blue?
Early Reader · Change the reading level on the articleFeynman diagram
Scientists use special pictures. These pictures show tiny things. The tiny things move and bump. They hit each other. This helps us see how they work. It is like a map. Can you draw a tiny map?
Early Reader · Change the reading level on the articleFictitious force
Some forces are not real. They only seem to happen. They happen when you move fast. Like in a fast car. You might feel a push. But nothing is pushing you. It is just your body moving. Can you feel a push in a car?
Early Reader · Change the reading level on the articleField line
Scientists use lines to see invisible things. These lines show how things pull or push. They can show a magnet. They can show how things fall. The lines help us see the way things move. Do you want to see them too?
Early Reader · Change the reading level on the articleFifth force
Some people think there is a new force. We know of four forces in our world. This new force might be a fifth one. It could be hidden from us. We are still looking for it. Do you want to help find it?
Early Reader · Change the reading level on the articleFine structure
Tiny parts make up everything. These small parts move in special ways. They can split into even smaller parts. This helps us learn how things work. It is very cool to see! Do you like to learn about small things?
Early Reader · Change the reading level on the articleFine-structure constant
Tiny bits of stuff have a pull. This pull is very strong. It helps things stay together. It is a rule of our world. It helps us all. Can you feel the pull?
Early Reader · Change the reading level on the articleFinite potential well
Tiny things live in a small space. This space has walls. The walls are not too strong. Sometimes, a tiny thing can get past them. It can be found outside the walls! Isn't that neat? Can you imagine being able to walk…
Early Reader · Change the reading level on the articleFinite strain theory
Some things change a lot. You can stretch a soft rubber band. You can bend a soft leaf. It looks very different. This helps us see how things move. Can you stretch something soft?
Early Reader · Change the reading level on the articleFirst law of thermodynamics
Energy is all around us. It can change from one thing to another. We cannot make new energy. We cannot make it go away. It just moves or changes. It stays in our world. Can you find energy today?
Early Reader · Change the reading level on the articleFirst observation of gravitational waves
Space has tiny ripples. These ripples come from big things. Two black holes crashed together. This made a wave in space. It moved like a little chirp. It helps us see the stars. Can you hear the chirp?
Early Reader · Change the reading level on the articleFlame test
Some things change fire colors. You put a tiny bit in a flame. The fire turns a new color. It might turn green or red. This helps us find what is inside. Can you see the colors?
Early Reader · Change the reading level on the articleFlash evaporation
Liquid can turn into gas fast. This happens when pressure drops. Some of the liquid turns to steam. This helps make clean water to drink. It is a very cool trick. Can you imagine steam appearing fast?
Early Reader · Change the reading level on the articleFlavour (particle physics)
Tiny bits make up our world. Some bits are like different kinds of fruit. There are many kinds of these bits. They can even change into new kinds! This helps everything work. Do you like to learn about small things?
Early Reader · Change the reading level on the articleFlerovium
Scientists made a new thing. It is a tiny part of matter. It is very hard to make. It only stays for a short time. We can only make one at a time. It is a big discovery! Do you like science?
Early Reader · Change the reading level on the articleFlocculation
Tiny bits can clump together. They stick to make big groups. These groups sink to the bottom. This helps make water clean. It is like magic! Can you see the bits sink?
Early Reader · Change the reading level on the articleFlory–Huggins solution theory
Some things mix well together. Long chains can sit in a liquid. They can stay mixed or pull apart. This helps us make new things. It is like magic! Do you like to mix things?
Early Reader · Change the reading level on the articleFlow measurement
We use tools to see how much water moves. These tools can be like a little wheel. The water makes the wheel spin. This helps us count the water. It is very useful! Do you like to splash in water?
Early Reader · Change the reading level on the articleFlow velocity
Water and air move in many ways. We can see how fast they go. It tells us where they are going. This helps us know how things move. It is fun to watch. Can you feel the wind move?
Early Reader · Change the reading level on the articleFlow visualization
We cannot see air or water move. People use smoke to see it. They can also use bright lights. This helps us see how things flow. It shows us how things work. Can you see the air move?
Early Reader · Change the reading level on the articleFluctuation–dissipation theorem
Things in our world move in many ways. Sometimes things get hot from rubbing. Other times, tiny bits bump and move. These two things are like a pair. When one happens, the other does too. Can you feel things move?
Early Reader · Change the reading level on the articleFluctuation theorem
Tiny things can act in funny ways. They do not always follow the rules. Sometimes, small things move backward. This can happen in tiny machines. It is a big surprise! Can you imagine things moving backward?
Early Reader · Change the reading level on the articleFluid
Some things can flow. These are called fluids. Water is a fluid. Air is a fluid too. They change shape to fit a cup. They move around easily. Do you like to splash in water?
Early Reader · Change the reading level on the articleFluoride
Some tiny things live in the earth. They are in rocks and water. They help keep your teeth strong. We find them in toothpaste too. It helps you stay healthy. Do you use toothpaste?
Early Reader · Change the reading level on the articleFluoroantimonic acid
This is a very strong liquid. It is the strongest acid we know. It can even eat through glass. We must keep it in special jars. It reacts fast with water. Can you imagine a liquid that strong?
Early Reader · Change the reading level on the articleFluorocarbon
Some special liquids are very strong. They do not mix with water. They can even help people in a hospital. They are also used to make non-stick pans. These liquids help us in many ways. Do you use a non-stick pan at…
Early Reader · Change the reading level on the articleFluorosulfuric acid
This is a very strong liquid. It is clear like water. Some parts look yellow. It can break things down fast. It is not safe to touch. Can you stay away from it?
Early Reader · Change the reading level on the articleFolding (chemistry)
Tiny things can fold into shapes. They bend to work well. This helps our bodies stay strong. It can even help make new things. It is like a tiny puzzle. Can you see the shape?
Early Reader · Change the reading level on the articleFoot-pound (energy)
A foot-pound is a way to measure work. It shows how much push you use. You use it to move things. It helps us know how strong an engine is. It can even tell us about a fast bullet. Do you like to see how things move?
Early Reader · Change the reading level on the articleFoot–pound–second system of units
We use tools to measure things. One tool uses feet for length. It uses pounds for weight. It uses seconds for time. These help us know how big things are. They help us work too. Do you use these tools?
Early Reader · Change the reading level on the articleForbidden mechanism
Some tiny bits of light move slow. They take a long time to move. This can happen for many years. It helps us see far away stars. It is very cool to see. Can you look at the stars?
Early Reader · Change the reading level on the articleForce carrier
Tiny bits act like messengers. They carry forces between things. They help bits push or pull. This makes the world work. It is all very small. Can you imagine tiny messengers?
Early Reader · Change the reading level on the articleForce field (physics)
Some things pull on you. Earth pulls on us all. It works even without touching. This pull is all around us. It helps us stay on the ground. Do you feel the pull?
Early Reader · Change the reading level on the article