Wind and Air: An Invisible Filling

Use observations to show that air takes up space and can move.

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A cup that looks empty contains air. Air is a mixture of gases, not empty space. A drawing may use dots to model particles too small to see. Moving air can make a breeze.

Worked example

Gently fanning a paper strip can make it move. You see the strip move rather than seeing individual air particles. That observation helps you reason about invisible air.

A cup outline contains enlarged model dots representing air particles. The dots are not dust or actual particle sizes; air takes up space even when it cannot be seen.

Would you believe it?

Most dry air is nitrogen, not oxygen. A rounded picture of 100 parts has about 78 nitrogen, 21 oxygen, and one part other gases. Water vapor adds a variable amount.

NASA: what air contains

Question 1 What fills an open cup that contains no visible liquid or solid? Air Only a vacuum Nothing with any matter

Question 2 What do the dots in the drawing stand for? Visible dust that must be present Actual-size stones Tiny air particles in a model

Question 3 What is a breeze? Air that has no space Moving air A kind of solid

Question 4 A gently fanned paper strip moves. What is a useful observation? The strip moved when air reached it All invisible things are wind The paper turned into gas

Question 5 Which statement about air is correct? Air exists only outdoors Air must be visible to be real Air takes up space

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