======Compressing Solids, Liquids and Gases======


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**Alternative titles:** Compressibility of Matter
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====Summary====                   
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====Procedure====  
  -Obtain three large syringes (50-100mL recommended). Leave one empty (air), fill one with water, and use one prefilled with small plastic pellets to represent a solid.  
  -For the syringe containing air: pull back the plunger to draw in air, seal the nozzle tightly with a thumb or a rubber eraser, and then push the plunger to feel the compression of the gas.  
  -For the syringe containing water: fill the syringe completely with water, remove all air bubbles, seal the nozzle, and then attempt to compress the water by pushing on the plunger.  
  -For the syringe containing plastic pellets: use a syringe half-filled with pellets, seal the nozzle, and try pushing the plunger to see whether the solid can be compressed. 
  -Compare how much the plunger moves in each case and discuss what this indicates about the spacing of particles in solids, liquids, and gases.



====Links==== 
How squishable are solids, liquids, and gasses? - Mr. Kish's Science Channel: 
{{youtube>TAvC1gWtWJk?}}\\

Gases are easiest to compress, solids most difficult | Compressibility | Chemistry - KClassScienceChannel: 
{{youtube>WrM5SQrRTMM?}}\\

📄 How Squishable? - SASP: [[https://www.csus.edu/indiv/k/kusnickj/k12ngss/10-howsquishable.pdf]]\\


====Variations====
  *Use different liquids (e.g., oil or glycerin) to test if all liquids are equally incompressible.  
  *Try syringes of different sizes to compare the volume change in gases.  
  *Perform the gas step using a pressure gauge attachment to measure the air compression quantitatively.  
  *Use a transparent syringe and film the plunger motion for comparison.



====Safety Precautions====
  *Wear safety glasses to prevent splashes during the water step.  
  *Do not point filled syringes toward anyone; pressure may cause contents to eject suddenly.
  *Ensure tight seals only with appropriate force; do not overstress or crack the syringes.




====Questions to Consider====
  *Which state of matter was easiest to compress? (The gas.)  
  *Which states of matter were hardest to compress? (The solid and the liquid.)  
  *What does the ease of compression tell us about particle spacing in gases, liquids, and solids? (Gases have widely spaced particles, while liquids and solids have particles close together.)  
  *Why do liquids flow but solids do not, even though both are nearly incompressible? (In liquids, particles can move around each other; in solids, they are locked in fixed positions.)  
  *How does this experiment support the particle model of matter? (It provides evidence that different states of matter differ in particle arrangement and movement, explaining compressibility.)