#  Pressure 

 



 ##  

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### Double Bubble

\[S | t+ | ★★★\]  
Double your pleasure with this puzzler: small bubble blows up large one.

\[[In-Depth Description](/presentations/double-bubble)\]

### Laplace's Law and Aneurysms

\[M | t | ★★\]  
Blow up a long cylindrical balloon and it inflates according to Laplace's law.

\[[In-Depth Description](/presentations/laplaces-law-and-aneurysms)\]

### Holy Siphon

\[M | t+ | —\]  
A siphon with holes in it reveals the pressure within.

### Siphon

\[M | t+ | ★★\]  
Transfer of water from one tank to another via rubber hose.  
  
\[[In-Depth Description](/presentations/siphon)\]

### Water Bottle and Lead Bricks

\[L | t+ | —\]  
Adding a small volume of water to a hydrostatic head connected to a water bottle raises lead bricks.

### Vacuum Cannon

\[M | t+ | ★★★★\]  
Air rushing into an evacuated tube pushes a ball down the tube with such a force and speed that it "blasts out" the other end and passes through several soda cans.

\[[In-Depth Description](/presentations/vacuum-cannon)\]

### Blow-Up Balloon in Vacuum

\[M | t+ | —\]  
A sealed balloon in a bell-jar "blows up" as the jar is evacuated.  
  
\[[In-Depth Description](/presentations/blow-balloon-vacuum)\]

### Golf Ball Atmosphere

\[L | t | ★★★\]  
Demonstration of molecular motion and pressure using golf balls.  
  
\[[In-Depth Description](/presentations/golf-ball-atmosphere)\]

### Coke Can

\[M | t| —\]  
A coke can with hot water vapor inside implodes dramatically upon touching cold water.

### Inverted Pascal Experiment

\[L | t++ | ★★★\]  
Upside-down version of Pascal's barrel-bursting experiment.  
  
\[[In-Depth Description](/presentations/inverted-pascal-experiment)\]

### 55 Gallon Drum

\[L | t+ | ★★★\]  
Drum evacuated by vacuum pump; crushed by atmospheric pressure.  
  
\[[In-Depth Description](/presentations/55-gallon-drum)\]

### Magdeburg Hemispheres

\[M | t+ | ★★★\]  
When evacuated, held together by bombardment of atmospheric molecules.  
  
\[[In-Depth Description](/presentations/magdeburg-hemispheres)\]

### Pressure and Depth

\[M | t+ | —\]  
Cylinder with water spouts at different depths.

### Pascal's Paradox

\[M | t | ★★\]  
Vessels with identical bases are filled to the same level and placed on a platform scale; scale measures force = area (same) x pressure (same).  
  
\[[In-Depth Description](/presentations/pascals-paradox)\]

### Pascal Vases

\[S | t+ | ★★\]  
Pressure at the bottom of a vessel is proportional to the depth of the liquid and independent of the volume and shape of vessel.  
  
\[[In-Depth Description](/presentations/pascal-vases)\]

### Fakir Physics

\[M | t | ★★★\]  
The concept of pressure is demonstrated by lying on a bed of nails.

\[[In-Depth Description](/presentations/fakir-physics)\]