Boyle’s Law Marshmallow Vacuum Syringe Expansion Chamber

25 mins Ages 6-11 Indoor

An engaging, screen-free learning activity that builds real-world creativity and critical thinking for kids aged 6 to 11.

Materials Needed

  • • Large 60 mL needleless plastic syringe (1 unit)
  • • Fresh mini marshmallows (4 units)
  • • Fine-point marker (1 unit)

Pro Tips

  • → Draw a smiley face on a mini marshmallow with a marker and place it inside the syringe barrel.
  • → Insert the plunger and seal the tip with a finger: pulling the plunger back drops the internal air pressure.
  • → As pressure plummets, the microscopic air pockets inside the marshmallow expand, inflating the face to double its size.

Safety First

Ensure syringes are blunt needle-free plastic medical/craft dispensers.

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Step-by-Step Instructions

1

Step 1

Draw a miniature cartoon face on a fresh mini marshmallow using a food-safe or permanent marker.

2

Step 2

Remove the syringe plunger, insert the marshmallow into the bottom of the barrel, and slide the plunger down gently.

3

Step 3

Cap the nozzle tightly with a thumb and pull the plunger back firmly, watching the marshmallow puff up to double size.

4

Step 4

Release your thumb to let atmospheric air rush back in, observing the instant re-compression of the marshmallow.

What they are learning

Boyle’s Law (pressure and volume inversely proportional) Sub-atmospheric gas bubble expansion Pneumatic hermetic seal integrity