1.Get out your science binder.2.Backpacks in the back of the

room.3.Get out a piece of notebook

paper.4.Get out a pencil.5.Sit quietly in the front of the

room.

Demonstrations

Directions• As we go through each

demonstration, your job is to observe quietly.

• You will need to take notes after each demonstration – words & pictures.

• These notes will be handed in for a grade.

• Title a piece of notebook paper Air & Water Demos

Air & Water• Air and water share many of the

same characteristics • Air and water “act” in the same way

– especially when hot or cold.• Air contains moisture (water)• Understanding the properties of air

and water is important to understanding weather.

#1:The Water Cycle• evaporation (Steam rising),• condensation (water collecting on

bottom of pan),• precipitation (drops of water

falling from pan).

Draw a picture of the lab

Investigating Air• Air is all around us but is difficult to

investigate because you cannot see, taste, or touch it.

Which has more weight – a balloon filled with air or an

empty balloon?

#2: Heavy Air?

Directions1. Weigh an empty balloon on a scale2. Record the weight3. Fill the balloon with air4. Weigh the balloon again5. Find the difference between the

weight with air and without air.

Directions1. Fill 2 balloons with air.2. Tie a string to each end of the

balloon and attach to a meter stick.3. Balance the scale.4. Put a hole in 1 balloon and let the

air out of the balloon.5. Observe what happens to the meter

stick.

What did we learn?

#2: Air has weight; the balloon with air weighs more than

without airDraw a picture of one of the

labs.

Air has weight• Even though air seems light, it has weight• The air inside a bus weighs as much as one of

the passengers• Even though we cannot feel it, there is about

14 pounds of air pressing down on every square inch of our skin

• Air pressure is a powerful force that is caused by a layer of air called the atmosphere which surrounds the earth.

• Air pressure is measured with an instrument called a barometer.

1. Attach 2 paper bags upside down at the end of each scale.

2. Using a lighter, heat the air under one bag.

3. Observe.4. Take the lighter away from under

the bag5. Observe

#3: Hot Air

Heating & Cooling Molecules• All materials are made of tiny particles called

molecules.• Molecules are always moving.• This movement creates heat.• The amount of heat depends on how fast the

molecules move.• As the molecules move faster, they take up more

space and make the object expand.• High temperature = Faster molecules• Low temperature = slower molecules• Animation• Really crazy animation (molecules in motion)

What did we learn?

#3: Hot air rises & is lighter than cooler air. The molecules spread

out & weigh less so the bag rises.

Draw a picture of the lab.

#4: A Balloon Full of…?1. Tie a balloon over an empty bottle2. Place the bottle in hot water3. Observe what happens to the shape of

the balloon

What did we learn?

#4: Hot air expands; the balloon inflated when the air in the bottle

heated up.

Draw a picture of the lab

What happens to the air inside a container when

heated or cooled?

#5: Can you Handle the Air Pressure?

Eggtastic!1. Put the empty bottle on a table.2. Peel the boiled egg.3. Light a match and drop it into the

bottle. Repeat about three or four times.

4. Quickly put the egg over the mouth of the bottle.

What happened?• The lit match heats the air inside the bottle.• When air is heated it expands and takes up more

room. • As the heated air expands, some of it escapes out

of the bottle. • When the matches go out, the air inside the

bottle cools and contracts, which takes up less room.

• This creates a lower pressure inside the bottle than outside the bottle.

• The greater pressure outside the bottle forces the egg to get sucked into the bottle.

When you add the match the air heats up and expands

When the match goes out the air shrinks reducing the pressure

inside the bottle

Crush that Can!1. Place an empty metal can on a heat

source2. Cover the can and remove from

heat. 3. Observe

What did we learn?#5:Hot air expands & takes up more

space than cold air - metal can collapses; cold air condenses & takes up less space- egg sucked into bottle (partial vacuum)

Draw a picture of the lab

#6: Swirls of Water1. Heat up a cup of water until it is hot2. Color the hot water red with food coloring.3. Cool off water with ice.4. Color the ice water blue with food coloring.5. Have a bowl or bin of room temperature

water. 6. Add the hot water one at one end of the

bowl and the cold water at the other end of the bowl.

7. Observe the water.

Density• Hot– Less molecules– Lower density– Lighter– Rises

• Cool– More molecules– Higher density– Heavier– Sinks

Currents

What did we learn?

#6: Hot water rises & moves to the top; cold water sinks & moves to the bottom.

(currents)

Draw a picture of the lab.

“Air”-y Facts1. Cold air sinks because it is denser than

warm air.2. Warm air is less dense than cold air.3. Warm air can hold more moisture than

cold air.4. When air cools, it loses some of its

moisture.5. Warm air rises, losing moisture as it cools.6. Cold air sinks and pushes up warm air.

Air & Water Demonstrations

1. Water Cycle: evaporation (Steam rising), condensation (water collecting on bottom of pan), precipitation (drops of water falling from pan).

2. Heavy Air : ball or balloon filled with air weighs more.

3. Hot Air : Warmer air is lighter (less molecules; molecules spread out) than cooler air; bag rises.

4. Balloon Full of… : hot air expands and takes up more space; balloon inflated when air in bottle heated up.

5. Eggtastic!: Cold air condenses,, & takes up less space than hot air; egg in bottle. (partial vacuum)

5. Crush that Can! :Hot air expands & takes up more space than cold air; metal can collapses.

6. Swirls of Water : Hot water rises and moves to the top; cold water sinks and moves to the bottom. (Currents)

Really crazy animation (molecules in motion)