# OS2 Changing Shape of Water

No matter what style of glass you pour water into, the water fits. You can pour water from a short fat glass into a tall skinny glass into a square glass. It still fits. Liquids like water are good at changing shape.

Changing shape is easy for water because it is a liquid. Water has no definite shape.

Does anything else change about water as it moves from one container to another?

Question: Does changing shape change anything else about water?

Materials:

Water

Tall skinny glass or jar

Short fat glass or jar

Square container

Scale

Ruler

Measuring cup

Procedure:

Mass the measuring cup

When measuring out water, remember it has a meniscus or dip in the surface. Water is measured to the bottom of the meniscus.

Pour 1 cup of water into the measuring cup and mass it

Mass the tall skinny glass

The problem with using this glass is how hard it is to see through it. I want to redo this project with a clear glass once I find one.

Pour the cup of water into the glass and mass it

Measure how wide the inside of the glass is in centimeters

Measure how high the water goes in the glass in centimeters

The volume of this jar will not be quite right as the bottom is not squared off. It is close.

Mass the short fat glass

Pour the water into it and mass it

Measure how wide the inside of the glass is

Measure how high the water goes in the glass

Mass the square container

When measuring any container for the inside volume, you are measuring the inside. This can be harder to do but the thick walls of this container distort the water volume results by almost 80 cc.

Pour the water into this container and mass it

Measure the sides of the container

Measure how deep the water is in the container

Pour the water into the measuring cup and mass it

Observations:

Amount of water to start:

Amount of water at the end:

Mass of water to start:

Mass of water at the end:

Analysis:

Subtract the mass of the empty container from the mass of the container of water to get the mass of water in the container.

The height of the water in the short fat jar is much lower than in the tall skinny glass.

Volume of a cylinder like a glass is the diameter times pi (3.14) times the height.

Volume of a square is the length of a side times the length of a side times the height.

The width is the diameter of the glass. Use the height of the water. Multiply to calculate the volume of water in each container.

Conclusions:

Did the height of the water change in the different containers?

Did the width of the water change in the different containers?

Compare how the height and width change.

Did the mass of the water change in the different containers?

Liquids like water change shape easily from round to square and back again.

Did the amount of water change as you poured it from one container to another?

How do you know?

What changes when water moves from one container to another?

What does not change when water moves from one container to another?

What I Found Out

I decided to measure out 250 ml of water. The water had a mass of 246 g.

When I poured the water into the tall glass, the height was 11 cm. The width was 5.4 cm so the water had a volume of 186.5 cc. The mass was still 246 g.

Glasses are slightly tapered. Jars have rounded bottoms. Square containers have rounded corners. Each affects the volume calculations a little.

When I poured the water into the fat jar, the height was only 8.1 cm. the width increased to 7.3 cm so the water had a volume of 185.7 cc.

When I poured the water into the square container, the water was 1.8 cm deep. The container was 10.6 cm by 9.5 cm so the water had a volume of 181.3 cc.

The height of the water was different in the different containers. The skinnier the container, the deeper the water was.

The mass of the water stayed almost the same. It got a little less from the beginning to the end.

The volume of the water did go down a little as I poured it into each container but stayed much the same. Each container was wet inside so some of the water did not our into the next one.

The amount of water stayed the almost the same because the mass and volume stayed almost the same. The changing shape was the only change in the water.