Properties of Air

What is the BEST definition of air?

• It is around us
• A mixture of many gases
• Oxygen
• We need it

What is NOT a property of air

• It is invisible  
• It has mass
• It takes up space
• It moves from low to high pressure

78% of the air around us is composed (made up of) what type of molecule?

• Nitrogen
• Oxygen
• Carbon Dioxide
• Hydrogen

21% of the air around us is composed (made up of) what type of molecule?

• H20
• Argon
• Oxygen
• Helium 

0.9% of the air around us is composed (made up of) what type of molecule? 

• Carbon Dioxide 
• Nitrogen
• Argon
• Neon

0.1% of the air around us is composed (made up of) what type of molecule?

• Other Trace Gases
• Nitrogen
• Carbon Dioxide
• Oxygen

Hot air ___________ and cold air __________

• Sinks, Rises
• Rises, Sink
• is fun, is lazy

Air has mass because it is composed of ___________________

• Atoms & Molecules 
• Dust
• Rainbows

Cold air is ______ dense than warm air

• More
• less
• the same 

Air pushes in _________ directions

• A bunch of
• 2
• all
• no