Formaldehyde
Some things are in the air. It is a clear gas. It can be found in space. It helps make things like paper. It is all around us. Can you feel the air?
Early Reader · Change the reading level on the articlePhysical Science articles — Page 6
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 6 of 57
Frame of reference
We use points to see where things are. These points help us find a place. It can be a moving place. It can be a still place. This helps us learn about space. Do you know where you are right now?
Early Reader · Change the reading level on the articleFrancium
Francium is a very rare thing. It is hard to find. It does not stay still for long. It breaks apart very fast. This makes it very hot. We cannot even see it. Can you find it in the ground?
Early Reader · Change the reading level on the articleFreezing
Liquid can turn into a solid. This happens when things get very cold. It can make ice. Freezing helps keep food good to eat. It is a neat thing to see. Have you ever seen ice form?
Early Reader · Change the reading level on the articleFrequency
Some things happen over and over. This is how often they happen. It can be a heart beat. It can be a sound. It helps us know how fast things go. Can you find something that repeats?
Early Reader · Change the reading level on the articleFriction
Rubbing things makes a force. It slows things down. It can even make heat. This helps you start a fire. It is all around us. Do you feel it when you move?
Early Reader · Change the reading level on the articleFriedrich Wöhler
Friedrich Wöhler was a scientist. He loved to study things. He found new metals. He made food for cells in a lab. This helped us learn how life works. Do you like to learn new things?
Early Reader · Change the reading level on the articleFritz Haber
Fritz was a smart man. He found a way to make food for plants. This helps us grow lots of food. It helps many people eat. He was a very famous scientist. Do you like to learn new things?
Early Reader · Change the reading level on the articleFructose
Fruit sugar is very sweet. It is in fruit. You can find it in honey too. It helps food taste good. We love sweet things! Do you like fruit?
Early Reader · Change the reading level on the articleFuel
Fuel gives us power. It can make heat. It can make light. We use wood for fires. We use oil for cars. It helps us do work. Do you see fuel around you?
Early Reader · Change the reading level on the articleFundamental interaction
Four big things act on our world. One pulls us to the ground. One makes lights shine. Two others work inside tiny bits. They help everything stay together. These things are very special. Do you feel the pull of the…
Early Reader · Change the reading level on the articleFuture
The future is what comes next. It is the time after now. It will surely happen. We can think about it. It can be a good thing. Do you wonder what is next?
Early Reader · Change the reading level on the articleGadolinium
This is a shiny metal. It can act like a magnet. It helps doctors see inside your body. It is very useful. Do you like magnets?
Early Reader · Change the reading level on the articleGallium
Some metal can melt in your hand. It is a shiny, silver metal. It stays hard when it is cold. It turns to liquid when it is warm. This metal helps make lights for us. Can you imagine holding melting metal?
Early Reader · Change the reading level on the articleGamma ray
Some light is very strong. It comes from tiny bits of things. This light can pass through many things. It can even go through walls. We must stay safe from it. Do you think it is amazing?
Early Reader · Change the reading level on the articleGasoline
Gasoline is a yellow liquid. It helps cars go. It is made from oil. This liquid helps engines work. It is very useful to us. Do you like to ride in a car?
Early Reader · Change the reading level on the articleGauge boson
Tiny bits of stuff move things. These bits act like messengers. They help things push or pull. This helps our whole world work. It is very cool. Can you imagine tiny messengers?
Early Reader · Change the reading level on the articleGauge theory
Small bits make up our world. They follow special rules. These rules help things work. They help tiny parts move. We use these rules to learn. Do you want to learn more?
Early Reader · Change the reading level on the articleGeneral relativity
Space and time are like a big sheet. Heavy things bend this sheet. This bend is what we call gravity. It helps us stay on the ground. It is very cool! Do you want to see more?
Early Reader · Change the reading level on the articleGeorg Ohm
Georg Ohm was a smart man. He studied how power moves. He learned how it works in wires. This helps us use lights today. He was a great teacher. Do you like to learn new things?
Early Reader · Change the reading level on the articleGermanium
This is a gray metal. It is hard and breaks easily. It helps our tools work. It is used in things like lights and glass. It is very special. Do you like to learn about new things?
Early Reader · Change the reading level on the articleGloss (optics)
Some things look very shiny. Smooth things bounce light well. This makes them look bright. Rough things spread light out. They look dull instead. Can you find something shiny?
Early Reader · Change the reading level on the articleGluon
{ "text":\"Tiny bits hold things together. They act like glue. They keep small parts stuck in a group. This helps make everything in our world. It is like magic! Can you imagine being so small? \"", "media": […
Early Reader · Change the reading level on the articleGraphite
Graphite is a dark rock. It is made of many thin layers. These layers slide past each other. This helps it work in pencils. We use it to write every day. Do you like to draw with pencils?
Early Reader · Change the reading level on the articleGravitational acceleration
Big things pull on other things. This pull makes things fall down. It works on every object. It helps keep us on the ground. It is a very big pull. Do you feel it too?
Early Reader · Change the reading level on the articleGravitational wave
Space has tiny ripples. They move very fast. Big things in space make them. These ripples help us learn. They show us the stars. Can you feel them?
Early Reader · Change the reading level on the articleGray (unit)
A gray is a way to measure energy. It tells us how much energy hits something. This helps doctors treat sick people. It also helps keep our food safe. It is a very helpful tool. Can you find it in a science book?
Early Reader · Change the reading level on the articleGregorian calendar
Most people use this calendar. It helps us track the days. It tracks how the Earth moves around the sun. This helps us know when seasons change. It also helps us pick the right day for holidays. Do you know what day…
Early Reader · Change the reading level on the articleGrey
Grey is a color. It is between black and white. You can see it in storm clouds. It is also in ash. Do you like the color grey?
Early Reader · Change the reading level on the articleGustav Kirchhoff
Gustav was a smart man. He studied light and power. He learned how the sun works. This helps us know the world. He was a great teacher. Do you like to learn?
Early Reader · Change the reading level on the articleGyroscope
A gyroscope is a spinning wheel. It stays very still. It does not tilt easily. This helps ships stay straight. It also helps phones work. It is like a toy top. Do you like spinning tops?
Early Reader · Change the reading level on the articleHaber process
We make food for plants. We take air and make it useful. This helps plants grow big. It is very important for us. It helps us feed the world. Do you like plants?
Early Reader · Change the reading level on the articleHadron
Tiny bits make up everything. These bits stick together. They are held by a strong force. This helps make the world. You are made of them! Can you imagine being so small?
Early Reader · Change the reading level on the articleHafnium
This is a shiny, gray metal. It looks like silver. It is found in rocks. It helps make power in big plants. We use it for many things. Can you find something shiny?
Early Reader · Change the reading level on the articleHaloalkane
Some things help us stay cool. They can be used in cans. Some help put out fires. They can also help make medicine. These things are used every day. Can you find them in your home?
Early Reader · Change the reading level on the articleHalogen
Some things make salt. These things are called halogens. They can be gas or solid. They help make the salt we eat. Some can be bad for us. Do you like salt on your food?
Early Reader · Change the reading level on the articleHamiltonian mechanics
A man named William found a new way to look at things. He looked at how things move. He used energy to help him. This helps us know how the world works. It is very cool! Do you like to see how things move?
Early Reader · Change the reading level on the articleHans Bethe
Hans Bethe was a smart man. He studied the stars. He learned how stars make light. This work helped us know the world. He won a big prize for it. Do you like looking at the stars?
Early Reader · Change the reading level on the articleHans Christian Ørsted
Hans was a smart man. He loved to learn. He found a way to use power. This power can move a needle. It helps us talk far away. Do you like science?
Early Reader · Change the reading level on the articleHarmonic oscillator
Some things like to move back and forth. A swing does this. A spring can do it too. It helps us make clocks. It even helps us make radios. Do you like to swing?
Early Reader · Change the reading level on the articleHarold Urey
Harold Urey was a smart man. He studied tiny things. He found a new kind of hydrogen. This helped us learn about the world. He even looked at rocks from the moon. Do you like science too?
Early Reader · Change the reading level on the articleHeat
Heat is moving energy. It moves from warm things to cold things. Small parts in things move to make heat. This movement helps things melt. It can even change ice to water. Do you feel warm today?
Early Reader · Change the reading level on the articleHeat capacity
Some things hold heat well. Water is very good at this. It keeps things warm. This helps us stay cozy. It is a neat trick of nature. Do you like warm water?
Early Reader · Change the reading level on the articleHeat transfer
Heat moves from warm to cold. It moves through things. It can move through air or water. It can even move through space. Heat helps keep us warm. Can you feel the sun's heat?
Early Reader · Change the reading level on the articleHeinrich Hertz
Heinrich Hertz was a smart man. He studied how things work. He found invisible waves in the air. These waves help us talk far away. This work helps us use radios today. Do you like to listen to the radio?
Early Reader · Change the reading level on the articleHelium
Helium is a light gas. It is found in the Sun. It can fill big balloons. This helps them float high. It can even change your voice! Do you like balloons?
Early Reader · Change the reading level on the articleHendrik Lorentz
Hendrik Lorentz was a smart man. He studied how light works. He also studied how magnets work. His work helps 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 articleHenri Becquerel
A man named Henri found a secret. He found tiny rays in rocks. These rays can go through dark paper. This helps doctors help sick people. He was a great scientist. Do you like to find secrets?
Early Reader · Change the reading level on the article