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Pascal’s Law, experiment by me.

en diciembre 1, 2010

La versión en español (y la original) de éste post está aquí: http://viclab.wordpress.com/2007/11/30/principio-de-pascal-experimento-por-mi/

This is the experiment that I presented on my physics class about fluid mechanics. First, let’s check what does the definition of the Pascal’s Law, say:

Pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure ratio (initial difference) remains same.

That’s the wikipedia definition. Now, the experiment:

Goal

Demonstrate Pascal’s law and know its effects visually applied to a fluid.

Materials

  1. A can of soda, filled
  2. A pen or a nail

Material

Development

With the pen or the nail, make a hole (CAREFULLY!!) on the side of the can, nearly the middle.

Make a hole on the can's side

Let the soda leave through the hole of the previous step, leaving about a quarter of the soda inside the can.

Let the soda leave through

Crush the can in several spots, avoiding cutting up the can’s plate.

Crush the can just a little

Hold the crushed can with your index and thumb fingers, cover completely the hole with the thumb.

Hold the can with your hand

Now, the fun. Turn the can or shake it a little.

Shake a bit the canTurn a bit the can

After a few movements… Voilá! The can returns to its original shape.

Tada!The physics behind this. The can recovers its shape because the soda that was left in the can, releases gas due to the shaking. It’s important to say that the gases are fluids too, not just the liquids.

Release the gas!

The liquid (soda) and the air in the can originally had a volume. Due to the soda’s gas release, that volume increases, which causes the air’s compression to keep the pressure insides.Air and soda's volume before and after

When the gases (air and soda’s gas) and the liquid (soda) reach their maximum compression limit, the pressure increases and as the Pascal’s Law says, the pressure is equally distributed in all directions. At the moment in which the insides pressure is greater than the outside air’s pressure, the can’s material is pushed off and recover its original shape.Pressure changes in all directions

Curious Extra Data

  1. Pressure in a Can of Soda: http://hypertextbook.com/facts/2000/SeemaMeraj.shtml
  2. Gluep – Solid or Liquid: http://scifun.chem.wisc.edu/homeexpts/gluep.htm I know it doesn’t have anything to do with pascal’s law, but it seems to be fun :)
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2 respuestas a “Pascal’s Law, experiment by me.

  1. [...] Noviembre 30, 2007 The English version of this post is here: http://viclab.wordpress.com/2010/12/01/pascals-law-experiment-by-me/ [...]

  2. Barbara dice:

    Thank you so much for this posting I am so excited to do this with my Webelos scouts!

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