The Cartesian Diver and the Force of Temperature

Done by Tan Yeh Wen 10S71

(To the graders: a detailed explanation for this video is given here)

Background (science):
All matter expand with temperature change due to the increase in kinetic energy of molecules.

As such, water expands with heat change, though it is not noticeable to us.

Due to this, when the water in the bottle is cold, and is cooled even further by the container, the original same mass of the water has now a smaller volume, allowing for more water to be added into the bottle.

When the water warms up to room temperature, the molecules gain kinetic energy, but are unable to move apart from each other due to the restriction of the bottle. As such, they exert an equal force on the bottle and the chilli packet.

Now, the air in the chilli packet is compressable, and as such, due to the increasing force as the water temperature rises to room temperature, the air in the packet is compressed, causing the packet volume to decrease, increasing its density.

At one point, its density will exceed the water, and it becomes negative bouyant. Then, it sinks.

Category:

Education

Tags:

• The
• Cartesian
• Diver
• and
• the
• Force
• of
• Temperature