# What is the science behind the Cartesian Diver?

Contents

## What theory is at work in Cartesian diver?

A Cartesian diver or Cartesian devil is a classic science experiment which demonstrates the principle of buoyancy (Archimedes’ principle) and the ideal gas law.

## How does Archimedes principle apply to the Cartesian diver?

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.

## What gas law explains the Cartesian diver?

Boyle’s Law describes the relationship between pressure and volume. Increasing pressure on a gas will decrease its volume. When the sides of the diver are pressed, the water is forced into the dropper, decreasing the volume of air in the dropper.

## Why does the Cartesian diver float at first?

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.

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## What do you mean by Cartesian?

[ kahr-tee-zhuhn ] SHOW IPA. / kɑrˈti ʒən / PHONETIC RESPELLING. adjective. of or relating to Descartes, his mathematical methods, or his philosophy, especially with regard to its emphasis on logical analysis and its mechanistic interpretation of physical nature.

## Does the temperature of the water affect the density of the ketchup packet?

Density deals with the amount of mass an object has. Adding salt to the water adjusted the water’s density to get the ketchup to float. … 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 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.

## 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.

## How does pressure affect the volume of gas?

Boyle’s law

Decreasing the volume of a gas increases the pressure of the gas. … When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume. This is shown by the following equation – which is often called Boyle’s law.

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