Ammonia
Some air has a strong smell. It is a gas. It helps plants grow big. We use it to make food for plants. It is found in space, too. Can you imagine a smell that strong?
Early Reader · Change the reading level on the articlePhysical Science articles — Page 3
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 3 of 57
Ammonium nitrate
This is a white salt. It helps plants grow big. It can also make things go boom. This is why we must be very careful. Do you know what plants eat?
Early Reader · Change the reading level on the articleAmmonium sulfate
Some white powder helps plants grow. It goes in the dirt. This helps the soil stay just right. It helps make food for plants. We use it to help farms. Can you find a plant today?
Early Reader · Change the reading level on the articleAmorphous solid
Some things are not in neat rows. They are messy inside. Glass is one of these things. It helps us see through windows. It is very useful. Do you see glass near you?
Early Reader · Change the reading level on the articleAmount of substance
Tiny bits make up everything. These bits are too small to see. We count them in big groups. This helps us know how much we have. It is a smart way to work. Do you want to count tiny bits too?
Early Reader · Change the reading level on the articleAmpere
Electricity moves in a flow. We call this flow current. We use a name called an amp to measure it. It tells us how much moves. This helps us use tools. Do you like using lights?
Early Reader · Change the reading level on the articleAmplitude
Waves go up and down. Some waves are very big. Some waves are very small. Big waves can make loud sounds. Small waves make quiet sounds. Can you hear a loud sound?
Early Reader · Change the reading level on the articleAnalytical chemistry
Scientists study what things are made of. They look at tiny bits of stuff. They can find out how much is there. This helps us stay healthy. It is like being a detective. What do you want to find?
Early Reader · Change the reading level on the articleAndrei Sakharov
Andrei was a smart man. He studied how things work. He also helped people be free. He won a big prize for peace. This helped the whole world. Do you like to learn new things?
Early Reader · Change the reading level on the articleAndré-Marie Ampère
André was a man who loved science. He studied how power moves. He learned a lot from books. His work helps us use light and tools. We use his name for power today. Do you like to learn new things?
Early Reader · Change the reading level on the articleAngular momentum
Things that spin have a special power. This power helps a bike stay up. It helps a spinning top stay tall. It even helps big storms move. This spin stays the same if nothing hits it. Can you feel things spin?
Early Reader · Change the reading level on the articleAntimatter
Some tiny things are like twins. They look like us. But they are not. They are called antimatter. They can turn into light. This helps doctors see inside you. Do you want to learn more?
Early Reader · Change the reading level on the articleAntimony
Antimony is a shiny grey metal. It comes from rocks in the ground. People used it for makeup a long time ago. It helps make things like batteries. It is very useful. Do you like shiny things?
Early Reader · Change the reading level on the articleAntiparticle
Everything is made of tiny bits. Some bits have a twin. The twin is the opposite. They can touch and go poof! They turn into light. It is like magic. Do you see the tiny bits?
Early Reader · Change the reading level on the articleArgon
Argon is a gas in our air. It is all around us. You cannot see it or smell it. It does not like to change. This makes it very safe to use. It helps us make bright lights. Do you like bright lights?
Early Reader · Change the reading level on the articleAromatic compound
Some tiny things make rings. These rings are very strong. They are found in nature. They are also in many things we use. They can even smell! Can you find a ring shape?
Early Reader · Change the reading level on the articleArsenic
Some things in the earth are not safe. This stuff can be bad for us. It can get into our water. We must be very careful. It is a real danger to people. Can you stay safe?
Early Reader · Change the reading level on the articleAstatine
Astatine is a very rare thing. It is hard to find in the earth. It is very hot and breaks apart fast. We cannot even see a real piece of it. It is a tiny mystery. Do you like mysteries?
Early Reader · Change the reading level on the articleAtomic mass
Everything is made of tiny bits. These bits are called atoms. Every atom has a small weight. This weight tells us how heavy it is. It helps us learn about our world. Do you want to learn more?
Early Reader · Change the reading level on the articleAtomic nucleus
Everything is made of tiny bits. These bits have a small center. This center is very heavy. It stays in the middle. It helps hold everything together. It is very small. Can you imagine something so tiny?
Early Reader · Change the reading level on the articleAtomic number
Everything is made of tiny bits. These bits have a special number. This number tells us what it is. It helps us know every part of our world. It is very neat! Can you find something made of these bits?
Early Reader · Change the reading level on the articleAtomic orbital
Tiny bits live in an atom. They move in a cloud. This cloud has a shape. The shape shows where they stay. It helps us know where they are. Can you see the cloud?
Early Reader · Change the reading level on the articleAtomic physics
Everything is made of tiny bits. These bits are called atoms. They have a center. Small parts move around that center. This helps make our whole world. Do you want to learn more?
Early Reader · Change the reading level on the articleAugustin-Jean Fresnel
A man named Augustin studied light. He made special glass lenses. These lenses help lighthouses shine bright. The light helps ships stay safe at sea. His work helps us see better today. Do you like bright lights?
Early Reader · Change the reading level on the articleBallistics
People can throw things far. You can throw a ball. Long ago, people used bows. They also used big tools to toss stones. This helps things fly to a spot. It is very cool to watch. Can you throw a ball far?
Early Reader · Change the reading level on the articleBase (chemistry)
A base is a special kind of stuff. It can feel slippery. It can also taste bitter. Bases can stop an acid. This helps fix some spills. Do you know a base?
Early Reader · Change the reading level on the articleBecquerel
We use a name to count tiny bits. It counts how many things happen in one second. This helps us stay safe and healthy. It is named after a man named Henri. It is a very small amount. Can you imagine counting every…
Early Reader · Change the reading level on the articleBenzene
Benzene is a clear liquid. It has a sweet smell. It is found in oil. People use it to make things. But it can be bad for us. We must be careful with it. Have you smelled gas before?
Early Reader · Change the reading level on the articleBernoulli's principle
Air and water can move fast. When they move fast, they push less. This helps things like planes fly. It can even help machines grab things. It is a cool way the world works. Do you want to see it move?
Early Reader · Change the reading level on the articleBeta particle
Tiny bits fly from some things. They move very fast. They can go through air. A thin metal sheet can stop them. They help doctors treat sick people. Do you want to learn more?
Early Reader · Change the reading level on the articleBinding energy
Tiny parts like to stick together. They hold on very tight. It takes energy to pull them apart. This energy helps things stay whole. It is like a strong hug. Can you find things that stick together?
Early Reader · Change the reading level on the articleBismuth
Bismuth is a shiny metal. It can look like a rainbow. It is used to help people feel better. It is safer than some other metals. Do you like shiny things?
Early Reader · Change the reading level on the articleBlack-body radiation
Hot things glow with light. A hot metal can look red. It can even look white. This helps us know how hot it is. The sun is very hot too. Can you see the glow?
Early Reader · Change the reading level on the articleBleach
Bleach helps make things white. It can clean things too. It kills tiny germs. This keeps us safe. It can be strong. Do not touch it. Be very careful! Can you find it at home?
Early Reader · Change the reading level on the articleBoiling
Hot water makes bubbles. The bubbles rise up. They turn water into air. This helps us cook food. It also makes water safe to drink. Can you see the bubbles?
Early Reader · Change the reading level on the articleBoric acid
This is a white powder. It can look like tiny crystals. It helps stop fires. It can also help clean small cuts. It is used in many things. Do you like to learn about science?
Early Reader · Change the reading level on the articleBoson
Tiny bits make up our world. Some bits carry force. They help things stay together. They even help things have weight. It is all very small. Can you imagine tiny bits? We are all made of them.
Early Reader · Change the reading level on the articleBremsstrahlung
Tiny bits of light can move very fast. When they hit something, they slow down. This makes them give off light. This light helps us learn about small things. It is like a tiny flash. Do you want to see more?
Early Reader · Change the reading level on the articleBromine
Bromine is a red liquid. It has a very strong smell. It can be found in the sea. Some things use it to stop fires. It is a very interesting thing. Can you imagine a red liquid?
Early Reader · Change the reading level on the articleBrown
Brown is a dark color. You can see it in the dirt. It is on tree bark too. Many animals have brown fur. This helps them hide. Do you see brown things today?
Early Reader · Change the reading level on the articleBuoyancy
Water can push things up. This push helps things float. Some things stay on top. Other things sink to the bottom. It helps a duck swim. It helps a big boat stay up. Do you like to swim in water?
Early Reader · Change the reading level on the articleButane
Butane is a kind of gas. It can be used for fuel. It helps make fires for cooking. It is also in some lighters. This gas helps us do many things. Can you find a lighter?
Early Reader · Change the reading level on the articleCalcium chloride
This is a white salt. It helps melt ice on roads. It can also stop dust on dirt roads. It helps keep food firm too. It is very useful. Do you see it in your food?
Early Reader · Change the reading level on the articleCapacitance
Some things can hold power. They act like tiny buckets. They keep power ready for later. This helps your toys work. It is very cool! Do you like tiny machines?
Early Reader · Change the reading level on the articleCast iron
Cast iron is a strong metal. It is made by melting iron. It can be used for pipes. It is used for parts in cars. This metal helps us build many things. Do you like things made of metal?
Early Reader · Change the reading level on the articleCausality (physics)
One thing makes another thing happen. This is called a cause. A push can make a ball roll. The push comes first. The roll happens next. Things cannot happen before they start. Does one thing make another happen to you?
Early Reader · Change the reading level on the articleCelsius
We use this to measure heat. It tells us if it is hot or cold. Water freezes at 0. It boils at 100. This helps us know the weather. Do you know how hot it is today?
Early Reader · Change the reading level on the articleCentripetal force
A pull helps things move in a circle. It pulls things toward the middle. This keeps them on a curved path. It helps planets move around the sun. This pull is very cool! Do you like to spin in circles?
Early Reader · Change the reading level on the article