A bag of marshmallows is used to demonstrate Boyle's Law, the relationship between pressure and volume.
Please don't eat the marshmallows, desiccators have chemical residues.
- Jet-puffed marshmallows (extra large)
- Vacuum pump
- Vacuum desiccator
- Hosing to connect vacuum to desiccator
- Place the entire bag of marshmallows in the desiccator.
- Attach the vacuum hose to the desiccator and engage the pump.
- At first the marshmallows inflate, as air trapped inside the marshmallows expands, demonstrating Boyle’s law that volume increases as pressure decreases.
- Whole bag can be “inflated” to fill entire vacuum chamber.
- When the vacuum is first applied, the marshmallows inflate, At a certain point gasses will escape the marshmallows and they will deflate.
- Pull the hose off the desiccator and the marshmallow will collapse to half their original size
PV = nRT
As Pressure (P) decreases, Volume must increase for nRT to remain constant.