May 9, 2018 You need: Clean paper (2) / pencil Composition of Air notes Lab Warm Up: Mental Math Quiz will begin shortly. Be ready! I CAN: determine how heat is transferred – and how it relates to density and pressure.

Teacher Workday Swagrrr No 7th test ELA 7 Math 7 Math I May 2018 Sunday Monday Tuesday Wednesday Thursday Friday Saturday   Forces and energy Magnets 1 Magnets / eclectricity 2 Electricity 3 Catch up 4 Review Test Assess MobyMax Milkshakes 5 6 7 Comp of Air Layers, Water Cycle 9 Atmosphere 10 11 12 13 Mother’s Day 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 No School Memorial Day 29 30 31 APRIL 30 Progress reports Teacher Workday Swagrrr No 7th test ELA 7 Math 7 Math I

June 2018 EOG testing Busch Gardens NCFE Sci/SS 1 2 3 4 5 6 7 Sunday Monday Tuesday Wednesday Thursday Friday Saturday   1 Atmosphere 2 3 4 5 6 7 8 Last day (due to snow) 9 EOG testing Busch Gardens NCFE Sci/SS

Demo – hand-warmer Explain the hand-warmer demo Ms.Garris showed.

Mixture of Gases in Air All Other Gases Argon = 0.93% Carbon Dioxide = 0.04%

NITROGEN A major part of proteins, including DNA Dilutes (thins out) the oxygen – too much or too little oxygen and we would die! Turned into useful form by nitrogen-fixing bacteria

OXYGEN Necessary to survive! Our cells use oxygen to create energy All of the oxygen in our atmosphere has been created by plants – photosynthesis! Burning requires oxygen

CARBON DIOXIDE Used by plants for photosynthesis A greenhouse gas – carbon dioxide helps keep our planet warm Increases in CO2 have been making the planet warmer: global warming!

TRACE GASES OZONE helps filter out the sun’s harmful rays ARGON is used in light bulbs because it will not catch fire even in extreme heat WATER VAPOR can condense to form clouds HELIUM inflates balloons and blimps

Earth’s atmosphere makes conditions on Earth suitable for living things: It traps energy from the sun keeping the Earth warm. The heat also keeps water in liquid form (good for life) It protects Earth from dangerous radiation and meteor collisions.

Let’s make a model! Write the notes ONTO the correct layer. Add color to the layers and the pictures. Cut out the layers and the pictures. Assemble on your notebook paper. **Be careful to place them low enough on the page so that they don’t stick out of the top of your binder!!**

TROPOSPHERE Shortest Layer (0-12 km) Average Temperature of 25°C (Temperature drops as you go higher) All of Earth’s weather happens here. Air here contains water & dust. Most of the atmosphere’s air is here (this layer is very dense).

STRATOSPHERE From the troposphere to about 50 km above earth’s surface There is almost no water or dust in this layer. Contains the OZONE LAYER (which absorbs UV radiation from the sun) Very cold, until the top of the layer, where it warms to 0°C.

MESOSPHERE 50-80 km above Earth’s surface. Temperature plunges to -90°C (the coldest in the atmosphere) Meteors burn up here while entering the atmosphere (friction). It offers protection.

THERMOSPHERE Thickest layer (80-400 km above Earth’s surface). Really thought of as two layers: ionosphere and exosphere. Ionosphere contains ions or charged particles allowing radio waves to bounce off and auroras to occur. Temperature can spike to 1,800°C.

EXOSPHERE “Exo-” means outer. Outer-most layer of the atmosphere. Not truly seen as a layer since it simply blends into outer space.

Comparing size and filler So yesterday, we talked about the layers of the atmosphere in comparison. If I take a slice – the portion of the TROPOSPHERE is smaller than the portion of the MESOSPHERE. We were comparing DENSITY

Back to your notes page… Altitude, or elevation, is the distance above sea level. As altitude increases, air pressure decreases. Air pressure decreases and this also means that density decreases. Low density can make it difficult to breathe (due to less oxygen)

Increase altitude = Decreased air… Decreased density Decreased air pressure

Decrease altitude = Increased air… Increased density Increased air pressure

Air pressure Air pressure – the result of weight of a column of air pushing down on an area, measured by an instrument known as a barometer. Barometer = Air pressure

Air Pressure in a Syringe Which syringe has the air under greater pressure? Which one is showing greater density? Low Pressure High Pressure

Exploring Air with Syringes Based on the investigation: What can air do? A few words you need to know… Compress – means to squeeze into a smaller space Density – the amount of mass (stuff) in a certain amount of space (volume) Air Pressure – the force of air pushing on stuff Barometer – a tool that measures air pressure COMPRESS

Is air pressure strong enough to push an egg into a bottle?

Homework Based on the egg in the bottle, write at least three sentences explaining how/why it worked. How can we get the egg out?