# Why does the Cartesian diver float at first?

Contents

As the water level rises in the diver, it becomes less buoyant and the diver sinks. As you release the pressure on the bottle, the compressed air expands and forces the water back out. The diver floats to the top of the bottle because now it is more buoyant.

## Why does the dropper initially float in the water?

Squeezing the bottle causes the diver (the eye dropper) to sink because the increased pressure forces water up into the diver, compressing the air at the top of the eye dropper. This increases the mass, and density, of the diver causing it to sink.

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## What does the Cartesian Diver teach about Archimedes Principle?

Archimedes’ principle applies because the Cartesian diver sinks when its density is increased. … As the volume of air decreases, water is taken up into the Cartesian diver which increases the density of the Cartesian diver so it sinks.

## Why does a pen cap sink when you squeeze the bottle?

When you squeeze the bottle, the air bubble in the pen cap compresses (gets smaller) and that makes it more dense than the water around it. When this happens, the pen sinks.

## How do you make a Cartesian diver?

1. Fill the bottle with water all the way to the brim.
2. Cut the length of the pipette off, leaving 2cm before the bulb.
3. Fit two metal nuts to the bottom of the cut pipette (or add plasticine to the pen cap).
4. Float the cut pipette in the water and adjust the weight to allow it to float.
5. Close the bottle and tighten the lid.

## Why do scuba tanks not float?

Steel scuba tanks do not float, they always are negatively buoyant. Aluminum scuba tanks sink when full but can float when empty due to losing the weight of the compressed air. When referring to how and why scuba tanks float, it all relates to buoyancy.

## Why is it called a Cartesian diver?

The Cartesian diver, named after French philosopher and scientist René Descartes, works because of several factors. When you squeeze the sides of the bottle, you are increasing the pressure on the liquid inside. That increase in pressure is transmitted to every part of the liquid.

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## Why do the Cartesian divers float and then sink at different times?

As the water level rises in the diver, it becomes less buoyant and the diver sinks. As you release the pressure on the bottle, the compressed air expands and forces the water back out. The diver floats to the top of the bottle because now it is more buoyant.

## What is the independent variable in the Cartesian diver experiment?

The independent variable in this lab is pressure ● The dependent variable is buoyancy of the cartesian diver.

## How do you make a Cartesian diver with a straw?

Assembly

1. Step 1: Fold straw or tubing in half and fasten. Straws: The straws are almost 6″ long. …
2. Step 2: Add weight to the diver. Pull the outside end of a paper clip out a bit.
3. Step 3: Fill the bottle with water and test the diver. …
4. Step 4: Make a Hook Out of Straws, Paper Clips and Tape.

## Will a paperclip sink or float?

It seems to defy the laws of physics, but a paper clip made of steel can indeed float on the water surface. The high surface tension helps the paper clip – with much higher density – float on the water. The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension.

## When the bottle is squeezed what if anything happens to the distance between the air molecules inside the bottle?

(a) When the bottle is squeezed what, if anything, happens to: (i) the distance between the air molecules inside the bottle? The distance gets smaller as the air molecules get closer to each other.

## Does the shape of an object affect its ability to float?

The shape of an object does affect its ability to float.

Some, such as cargo boats, are made of steel. Clearly, steel is more dense than water, yet these boats still float.

## Does the size of the bottle affect how much you have to squeeze to get the packet to sink?

When you squeeze the bottle hard enough, you put pressure on the packet. That causes the bubble to get smaller and the entire packet to become MORE DENSE than the water around it and the packet sinks.

## How do you make a diving bottle?

Instructions

1. Cut out your diver using the same shape and size indicated above. …
2. Cut the straw and position it on the paper-clip as show above. …
3. Slowly slide the straw onto the diver as show above. …
4. Place a small piece of play-dough or putty on the diver’s feet.
5. Fill a glass with water and put the diver in.

## How does this experiment relate to what you’ve learned about submersible technology such as submarines and ROVs?

How does this experiment relate to what you’ve learned about submersible technology such as submarines and ROVs? The experiment relates to what i learned about submersible technology such as submarines and ROV´s because they both dealt with pressure.