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Smells Travel Through the Air to Your Nose · What Stuff Is Like · air as matter · smell travels through air

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Smells Travel Through the Air to Your Nose

with Atlas

Atlas stands in a sunny kitchen holding a warm cinnamon muffin fresh from the oven, nose lifted high with a big curious smile, while wavy orange lines drift through the air from the muffin toward a child's nose nearby.

Identify air as a real material even though we cannot see it.
Explain that smells travel through the air from one place to another.
Predict which objects in a room might send a smell through the air.
Compare things we can see with things we can feel but cannot see, such as air.

Key terms

air: the matter all around us that we cannot see but can feel
matter: anything that takes up space, including air, water, and rocks
smell pieces: tiny pieces of an object that float into the air and reach your nose
invisible: something that is really there but too small or clear to see

Air Is Real Matter

Air is all around you right now, even though you cannot see it with your eyes. Air takes up space just like water or a rock, which means air is matter. You can prove air is real by feeling it push on your skin when the wind blows or when you wave your hand. Air being invisible does not make it nothing; it is a real material that is simply too clear to see.

How Smells Travel

When something smells, like a warm muffin or a fresh flower, tiny pieces of that thing float off and drift into the air. These smell pieces are far too small for your eyes to spot. When they float into your nose, your nose senses them and you smell the object. That is why you can smell dinner from another room before you ever see the food cooking on the stove.

Seeing Versus Smelling

Some things we learn about by seeing them, and some we learn about by smelling. You can see a rock or a marble clearly, but those hard, dry objects do not send smell pieces into the air, so they have little smell. Foods and flowers do release smell pieces, so you can smell them even from far away. Comparing what you see with what you smell shows that air carries information your eyes cannot.

Worked examples

Explain how you can smell popcorn from another room.

Tiny smell pieces float off the warm popcorn into the air.
The air carries those pieces from the kitchen toward you.
When the pieces reach your nose, you smell the popcorn.

Answer: Tiny smell pieces travel through the air from the popcorn all the way to your nose.

Hi, I am Atlas! Let me tell you something amazing. Air is all around you right now. You cannot see it, but it is really there. Air takes up space, just like water or a rock. Air is matter! Now here is the cool part. When something smells — like a muffin, a flower, or an orange — tiny pieces of that thing float into the air. You cannot see those tiny pieces. They are far too small. But when they float into your nose, your nose knows! That is how you smell things from far away. Have you ever walked into a kitchen and smelled dinner before you saw it? Those tiny smell pieces traveled through the air all the way to you. So air carries smells. Air is real, even when you cannot see it.

Activity

Drag each item to show whether it could send a smell through the air

Practice

Predict which would send a smell: a flower or a dry rock.

Explain one way you can tell that air is really there.

Common mistakes to avoid

Air is nothing because you cannot see it.Air is real matter that takes up space, and you can feel it move when the wind blows.
Your nose moves to the food to smell it.Your nose stays put while tiny smell pieces travel through the air to reach it.

Check your understanding

You smell popcorn from the other room. How did the smell reach your nose?

Atlas says air is matter even though you cannot see it. What is one way you know air is really there?

Recap

Air is real matter all around us even though we cannot see it, and you can feel it when the wind blows. Smells travel because tiny pieces of an object float into the air and drift all the way to your nose.

Reflect

What is a favorite smell that has traveled to your nose?