Atmosphere intro!

Chapter 11
The Atmosphere
Lesson 1 & 2

Earth's modern atmosphere consists mostly of Nitrogen as a diatomic molecule.

78% of the atmosphere is Nitrogen in this diatomic state.

The composition of Earth's atmosphere.

Dropdown

What is the percentage of nitrogen in Earth's atmosphere?​

Select answer

Oxygen in the form of the diatomic molecule O2 is the next most abundant gas in the atmosphere.

Oxygen is 21% of Earth's atmosphere!

Composition of Earth's atmosphere.

Argon is 0.9% of the atmosphere.

Trace gases fill up the rest as well as things like dust, water, and compounds.

Composition of Earth's atmosphere!

Match

Match the following to the right information.

• Oxygen

• Nitrogen

• Argon

• Carbon Dioxide

• Dust

21% of Earth's atmosphere

78% of Earth's atmosphere

0.93% of the Earth's atmosphere.

Chemical compound that's about 0.03%

Solid particles in the atmosphere

• 21% of Earth's atmosphere

• 78% of Earth's atmosphere

• 0.93% of the Earth's atmosphere.

• Chemical compound that's about 0.03%

• Solid particles in the atmosphere

We call this: The Weather!

The condition of the atmosphere at a particular time & place!

Things that happen in one part of the atmosphere affect other parts.
The energy for this system is provided by the sun!

The atmosphere is a system!

Multiple Choice

What is a system?

• a group of parts that work together as a whole.

• A set of numbers that add to zero.

• An isolated part of a chain of events.

• The beginning of change.

The amount of mass in a volume.

d=m/v

Density

Amount of matter in an object.

Anything made from atoms has mass!

Mass

Amount of force on a given area!

P=F/A

Pressure

​Air has properties!

Drag and Drop

​

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is the amount of matter in an object.

​

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is the measure of a force on an area.

​

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is the amount of mass in a volume!

Drag these tiles and drop them in the correct blank above

Density

Pressure

Mass

We call this
Air Pressure!

The result of a column of air pressing down on an object!

PSI is used in the USA

Pa is used everywhere else. (The SI unit of pressure.)

Pound Per Square Inch vs
Pascals

Match

Match the following!

• Atmosphere

• PSI

• Pascals

• Air Pressure

a layers of gases that surrounds Earth

Used in the US to measure Air Pressure

The SI unit to measure Air Pressure

The result of a column of air pressing

• a layers of gases that surrounds Earth

• Used in the US to measure Air Pressure

• The SI unit to measure Air Pressure

• The result of a column of air pressing

A device used to measure Air Pressure!

Barometers!

A device that measured the weight of the air by the amount of mercury being forced up a tube by the pressure from the atmosphere.

Mercury Barometer!

This barometer uses an air-tight chamber that flexes when exposed to different pressures. The flexing causes a needle to move and indicate the pressure.

Aneroid Barometer!

Most weather reports use this unit. A normal sunny day @ sea level is typically 30inHg

Inches of Mercury!

The National Weather Service uses millibars.
1mb = 100Pa

Normal atmospheric is 1013 mb

Millibars

1/1000th of a bar and is the amount of force it takes to move an object weighing a gram, one centimeter, in one second

This is what a Millibar means.

​Units of Atmospheric Pressure:

Match

Match the following!

• Weather reports use:

• National Weather Service uses:

• What has 4 wheels and flies?

Aneroid Barometer!

Mercury Barometer!

inches of Mercury (inHg)

Millibars

A garbage truck!

• Aneroid Barometer!

• Mercury Barometer!

• inches of Mercury (inHg)

• Millibars

• A garbage truck!

The higher you go--the less air above you!

This means there is less pressure at higher altitudes and vice-versa!

Altitude Affects Air Pressure!

Match

Match the following!

• Atmosphere!

78% of Atmosphere!

Measures air pressure!

Density

Weather!

Where Earth gets its energy!

• 78% of Atmosphere!

• Measures air pressure!

• Density

• Weather!

• Where Earth gets its energy!