Liquids
Cartesian Divers
Purpose: To construct a Cartesian Diver and explore the properties of gases.
Materials:
• Water bottle and water
• Eye Dropper
• Condiment packets
Eyedropper Procedure:
1. Construct a Cartesian Diver by filling a water bottle nearly full with water and then adding an eye dropper that has a small amount of water drawn into it.
2. The dropper should float in an upright position, if it does not, adjust the amount of water in the dropper. Small Ketchup Packet Large Ketchup Packet Small Mustard Packet Large Mustard Packet
Bottle not Squeezed Sinks Floats Floats Sinks
Bottle Squeezed Sinks Sinks Floats Sinks
3. Secure the cap on the water bottle and firmly squeeze the bottle. The eye dropper should sink to the bottom. If…show more content… Test them in the water bottle, which ones can you make sink?
Analysis, questions to consider.
What happens to the water level in the bottle when you squeeze it? What happens to the volume of the bottle when you squeeze it? The water level inside the bottle increases when the bottle is squeezed. When squeezed, the volume of the bottle decreases.
What happens to the volume of the air space IN the eye dropper when you squeeze bottle? When the bottle is squeezed, water enters the eye dropper, reducing the volume of the air space inside. This leads to the eye dropper sinking when enough water is inside.
Does the actual number of air molecules inside the eye dropper change when you squeeze the bottle? As the air molecules are trapped inside the eye dropper when the bottle is squeezed, the actual number of air molecules does not change. Instead, these air molecules are compressed into the top part of the eye dropper.
Does the weight of the eye dropper (glass and rubber bulb) change when you squeeze the…show more content… What did they have in common? According to our data, the only condiment packet that acted like a Cartesian diver, is the large ketchup packet. This packet was able to float when the bottle wasn’t squeezed and sunk when the bottle was squeezed.
Be sure to explain how you think the Cartesian Diver works after considering the questions above. When an individual squeezes the sides of a bottle, they are applying pressure to every part of this bottle. This causes the volume inside to decrease, leading to rising water levels and the compression of air molecules. Some water enters the eye dropper due to this pressure being applied. As water is more dense than air, and there is more water than air Inside of the eyedropper, the eyedropper sinks. On the other hand, if the bottle is no longer squeezed, the less pressure allows the water to leave the eyedropper, letting it float back to the top. According to the equation, D=M/V, the decrease of volume due to squeezing the bottle increases the density. This is an alternative way to view why the eye dropper sinks or floats depending on the pressure being applied to the
