Phases of Matter

Season 01

Episode 08

Duration 23:08

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Everything around us is made of matter. But did you know that matter can exist in different forms? In this episode, Bill Nye explores the three main phases of matter—solid, liquid, and gas. He explains how matter changes from one phase to another and why temperature plays a key role.

Matter is constantly shifting. Water can freeze into ice, melt into liquid, or evaporate into steam. These changes happen all around us, from the air we breathe to the food we eat. Bill Nye uses fun experiments to show how molecules behave in each phase.

The Three Phases of Matter

Matter exists in three common forms—solids, liquids, and gases. Each phase behaves differently:

Solids have a fixed shape because their molecules are packed tightly together.
Liquids take the shape of their container, as their molecules move more freely.
Gases spread out and fill the space they are in, since their molecules move rapidly.

Bill Nye explains that adding or removing heat causes matter to change phases. For example, melting, freezing, condensation, and evaporation all occur due to temperature changes.

Bill Nye’s Fun Experiments

Bill Nye makes science exciting with hands-on experiments!

Melting and freezing – He heats ice until it melts and then refreezes it, demonstrating how temperature affects phase changes.
Boiling water and evaporation – He shows how water turns into steam, proving that gas molecules move quickly and expand.
Liquid nitrogen tricks – Bill uses super-cold liquid nitrogen to freeze objects instantly, revealing how extreme cold changes matter.

Through these demonstrations, Bill makes it easy to see why temperature matters in phase changes.

Why Phases of Matter Matter

Understanding matter is important for many reasons. Engineers use heat and pressure to shape metals. Chefs rely on phase changes when cooking food. Even nature depends on matter shifting between states—rain, snow, and clouds all form due to these processes.

Bill Nye also explains how scientists use phase changes in space exploration. For instance, rocket fuel must shift between liquid and gas to power space travel. Additionally, refrigeration and air conditioning systems rely on phase changes to cool things down.

Modern Science and Matter

Today, scientists have discovered even more phases of matter, including plasma and Bose-Einstein condensates. Plasma is found in the Sun and lightning, while Bose-Einstein condensates appear at ultra-cold temperatures. These discoveries help us learn more about physics, energy, and the universe.

Scientists continue to explore new materials that change phases in extreme conditions. From self-healing metals to superconductors, these breakthroughs could lead to exciting inventions in the future.

Conclusion

Bill Nye wraps up this episode by reminding us that matter is always changing. Whether freezing, melting, or evaporating, phase changes are happening around us all the time. Understanding these processes helps us cook, build, and explore space.

So, the next time you see ice melt or steam rise, remember—it’s all part of the science of matter!

Phases of Matter

Based on Bill Nye the Science Guy · Season 1, Episode 8 · 23 min

We know water can freeze into solid ice, but what about the invisible air all around us? Can gases turn into liquids, or even solids, if they get cold enough?

Step 1 of 6 · Engage

Engage

Is it Possible to Freeze Air?

Explore

Put Your Instincts to the Test

Think about what you already know about temperature and phases. Pick an answer for each question, then see if your instincts were right.

What happens if you put a bouncy rubber ball into liquid nitrogen (-196 degrees Celsius) and then drop it?

Is the cloudy "steam" you see coming out of a boiling kettle actually a gas?

Can scientists reach "Absolute Zero", the exact temperature where all molecules stop moving entirely?

Explain

Understanding the Science

Tap each card to reveal the science behind solids, liquids, gases, and how they change from one state to another.

Key Concepts

Try It: States of Matter Basics

Heat, cool, and compress atoms and molecules to see how they change between solid, liquid, and gas phases.

Simulation by PhET Interactive Simulations, University of Colorado Boulder. Licensed under CC-BY 4.0.

Elaborate

Apply Your Knowledge

Now let us see if you can connect what you have learned to the real world.

Match the Concepts

Click an object to select it, then click the matching description to place it.

Items

Solid Ice

Liquid Water

Water Vapour

Liquid Nitrogen

Molecules are packed tight and hold shape

Molecules move faster and flow

Molecules move wildly and are invisible

-196 degrees Celsius and boils at room temperature

Real-World Challenge

Imagine you are an aerospace engineer designing a rocket fuel tank. The rocket needs to carry liquid hydrogen, which normally exists as a gas on Earth. Based on what you have learned about energy and phases of matter, what challenges will you face to keep the fuel in its liquid phase, and how might you solve them?

Science Update

What Has Changed Since This Episode Aired

This episode of Bill Nye the Science Guy first aired in 1993. While the core science remains accurate, here are a few things that have been refined or expanded since then.

Evaluate

Test Your Understanding

Answer these questions and get instant feedback. How many can you get right?

Reflection

What surprised you the most about how extreme cold affects everyday objects? Can you think of a situation in your daily life where understanding phase changes is important?

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Phases of Matter

The Three Phases of Matter

Bill Nye’s Fun Experiments

Why Phases of Matter Matter

Modern Science and Matter

Conclusion

More Seriously Scientific Links

Bill Nye The Science Guy

Season 1 (20 episodes)

Season 2 (20 episodes)

Season 3 (21 episodes)

Season 4 (19 episodes)

Season 5 (20 episodes)

Episode Discussion

1 Comments

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Phases of Matter

Is it Possible to Freeze Air?

Put Your Instincts to the Test

Understanding the Science

Key Concepts

Solid, Liquid, Gas

Melting (Solid to Liquid)

Freezing (Liquid to Solid)

Evaporation & Boiling (Liquid to Gas)

Condensation (Gas to Liquid)

Sublimation (Solid to Gas)

Energy is the Key

Absolute Zero

Try It: States of Matter Basics

Apply Your Knowledge

Match the Concepts

Real-World Challenge

What Has Changed Since This Episode Aired

Test Your Understanding

Results

Reflection