# Frequent question: How do you make a Cartesian diver?

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## Why does a Cartesian diver sink when you squeeze it?

The reason the diver sinks when you squeeze the bottle is because the pressure exerted on the water collapses the sides of the pipette. Squeeze the bottle and watch how the sides of the pipette cave inward. This decreases the volume of the diver.

## How does a Cartesian diver work gas laws?

The Cartesian diver demonstrates not only buoyancy, but the implications of the ideal gas law and Pascal’s principle as well. Squeezing on the top of the sealed plastic container decreases the volume and therefore increases air pressure above the water. … This decreases the buoyant force on it enough to cause it to sink.

## What is the purpose of Cartesian diver?

The Cartesian diver demonstrates the concept of density as a function of mass and volume. In the bottle’s uncompressed state, the medicine dropper floats because there is not enough mass in the volume of the medicine dropper to make it sink (i.e. its density isn’t great enough).

## What is meant by Cartesian diver?

: a small hollow glass figure placed in a vessel of water that has an elastic cover so arranged that by an increase of pressure the water can be forced into the figure producing the effects of suspension, sinking, and floating as the pressure varies.

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## How do you make a Cartesian diver with a ketchup packet?

How the Trick Works. An air bubble is trapped inside a ketchup packet when it is sealed at the factory. If the bubble is big enough, it makes the packet float in water. When you squeeze the bottle, the water won’t compress but the air bubble inside the ketchup packet is squeezed and becomes smaller.

## Would a pen cap float in water?

Like a pen,as it has a plastic body and a refill in it,its weight is more as compared to that of cap which has air pockets and its is lighter than water. 3. Thus , a pen cap floats but the pen sinks in water.

## Why does an empty bottle float?

An empty plastic bottle has air inside it which means that it reduces its density due to which it is able to float over water. … In other words, its density is less than the density of water due to which reason it floats.

## What happens to the medicine dropper as you press the container and release it?

So when you push more water inside the dropper, you increase its overall density. … Release the pressure on the bottle’s sides and you stop forcing water inside the eye- dropper. The air inside it will now push out the extra water again, and the eye-dropper will rise.

## What does the Cartesian Diver demonstrate about Pascal’s principle?

The Cartesian diver is a classic demonstration which effectively demonstrates Pascal’s Principle, which states that Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid.

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